Undertale Wiki - 新しいページ [ja]

3Dトリエル

2026-07-10T15:52:04Z

Na249: ページの作成:「{{Infobox character |image = 3D Toriel artwork concept.png |pronouns = 彼女<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 19724}}</ref> |location = * ''UNDERTALE''のトレーラー * ''UNDETALE''の記念配信イベント * ''UNDERTALE''のグッズ }} {{jp-inline|3Dトリエル|3D Toriel}}<ref>[https://www.fangamer.jp/products/just-a-regular-toriel-keychain 3Dトリエルキーホルダー]</ref>は''UND…」

{{Infobox character
|image = 3D Toriel artwork concept.png
|pronouns = 彼女<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 19724}}</ref>
|location =
* ''UNDERTALE''のトレーラー
* ''UNDETALE''の記念配信イベント
* ''UNDERTALE''のグッズ
}}
{{jp-inline|3Dトリエル|3D Toriel}}<ref>[https://www.fangamer.jp/products/just-a-regular-toriel-keychain 3Dトリエルキーホルダー]</ref>は''[[UNDERTALE]]''のトレーラーやグッズと言ったプロモーションに登場するキャラクターである。

== プロフィール ==
=== 外見 ===
3Dトリエルは[[トリエル]]の粗い3Dモデルで、顔、耳、手足は全て球体で構成されている。常に無表情で、[[wikipedia:Tポーズ|Tポーズ]]を取っている。また、目からレーザーを発射することができる。

=== 性格 ===
3Dトリエルはたまに''UNDERTALE''に描かれていない、トリエルらしくない行動をとる。3Dトリエルはほとんどしゃべらず、レーザーを発射する、いつ攻撃されるかわからない敵対的な存在とされている。6th Anniversary Streamでは、攻撃する前に意味不明な言葉をつぶやいているシーンがある。

== 描写 ==
3Dトリエルは''UNDERTALE''本編には登場しないものの、多くの''UNDERTALE''にまつわる文脈に登場する。

=== 発売アナウンストレーラー ===
3Dトリエルは、2015年9月8日の発売アナウンストレーラーで初めて登場した<ref>{{Cite youtube|id = ep678gvMAnw|title = UNDERTALE 日本語版発売アナウンストレーラー|timestamp = 61}}</ref>。その中のとあるシーンで、3Dトリエルが白いブロックに体当たりし、リアルなヤギと「''ひどい子…　わたしの　こころは　ズタズタよ''」というテキストが添えられ、下には「''※実際のゲーム画面ではない可能性があります''」という注意書きがされていた。このシーンは2017年6月13日のPlayStation 4およびPlayStation Vitaの発表アナウンストレーラーでも使用された。この時使用された「ビューティ」という[[フレーム]]は、[[ハードモード]]をクリアすると入手できた<ref>{{Cite youtube|id = cph6XMXRKzY|title = UNDERTALE - PS4, PS Vita Announce Trailer {{!}} E3 2017|timestamp = 68}}</ref>。

3Dトリエルのシーンは、2018年9月17日のNintendo Switchの発売記念トレーラーで置き換えられた<ref>{{Cite youtube|id = fsKLv0YbAU4|title = fsKLv0YbAU4|timestamp = 63}}</ref>。このシーンでは[[ぷんすかみゅうみゅう]]が、レーザーを打つ3Dトリエルから逃げる様子が描かれ、添えられたテキストには「''ひどい子…　あなたの　こころを　ズタズタに　してあげるわ''」と、注意書きとして「トビー！　この映像　どこで　拾ってきたの？？？」というテキストがあった、

3Dトリエルは2021年3月15日のXbox Oneの発売記念トレーラーでも短く登場し<ref>{{Cite youtube|id = ITp1Egf_jq4|title = 発売記念トレーラー（Xbox One）|timestamp = 33}}</ref>、その場で回転する3Dトリエルとそれのワイヤーフレームコピーが映っていた。画面下部には「''トリエルのパフォーマンスを極限まで向上！''」と書かれていた。

=== 記念配信イベント ===
3D Toriel makes an appearance in the ''Undertale'' 6th Anniversary Stream.<ref>{{Cite youtube|id = rksOYId-cNA|title = UNDERTALE 6th Anniversary So We Play DELTARUNE Chapter 1 For Some Reason - LIVE!|timestamp = 5140}}</ref> Here, she walks into the room, speaks gibberish, and shoots lasers at the stream's hosts before the stream pauses.

3D Toriel makes another appearance in the ''Undertale'' [[10th Anniversary Stream]].<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 19706}}</ref> Noticing that she is a piñata, Reid Young brandishes a bat and swings at her, despite the other stream hosts' insistence that he do not. As he hits her, the screen cuts to a hybrid mashup of the 3D Toriel scenes in the ''Undertale'' trailers before cutting back to the set. The camera focuses on 3D Toriel staring at the screen before cutting to black.

=== ''UNDERTALE Art Book'' ===
Toriel's 3D figure also appears in the ''[[UNDERTALE Art Book]]'', with a description stating that [[Toby Fox]] created it for an "extremely realistic, emotional scene". The scene had to be cut because "it looked so good, it made the rest of the game look terrible" and replaced with [[Onionsan]].<ref name="Art Book">{{Cite game|We created this high-fi 3D Toriel for an extremely realistic, emotional scene. I even hired a professional artist to create a new character design that could properly convey the depth of the scene. Afterwards, Chelsea rendered the sketch flawlessly into 3D.|Sadly, the scene had to be cut because it was so good, it made the rest of the game look terrible. So I took the opposite approach and replaced it with Onionsan. And that’s why anyone likes UNDERTALE.|Chelsea’s comment: “This is the best thing I ever made. And while I respect Toby’s decision, I’ll be filled with regret for the rest of my life.”|Toby Fox, ''UNDERTALE Art Book'', pg. 83}}</ref>

=== Merchandise ===
On April 1, 2026, Fangamer revealed a [https://www.fangamer.com/products/just-a-regular-toriel-keychain keychain of 3D Toriel], designed by Melora Mylin.

== Creation and development ==
3D Toriel was designed by a "professional artist" (labeled as "Laura MW, Adil Mohyuddin" in the ''UNDERTALE Art Book''<ref>''UNDERTALE Art Book'', pg. 82, ISBN [[Special:BookSources/9781945908781|9781945908781]]</ref>) and later rendered into 3D by Chelsea Saunders.<ref name="Art Book" />

== Gallery ==
<gallery>
3D Toriel artwork wireframe.png | A wireframe view of 3D Toriel's model.
3D Toriel artwork keychain.png | 3D Toriel Keychain sold on Fangamer.
</gallery>

== References ==
<references />

{{Navbox characters}}
[[Category:Characters]]
[[Category:Events outside Undertale]]

『UNDERTALE』10周年記念配信イベント

2026-07-10T12:40:02Z

Na249:

{{DISPLAYTITLE:『''UNDERTALE''』10周年記念配信イベント}}
{{Infobox event
|title = 『''UNDERTALE''』10周年記念配信イベント
|image = 10th Anniversary Stream logo.svg
|caption = [[うざいイヌ]]が「10th」と書かれたテレビの前で遊んでいる様子を描いたロゴ。
|location = [https://undertale.com/10/ undertale.com/10/]
|status = 終了済み
|started = 2025-09-20T16:00-08:00
|ended = 2025-09-21T22:00-08:00
}}
{{Quote
| The world
is as big as you want it to be.
Where will you go next?
(この　せかいは
キミが　のぞむほど
ひろくなる。
つぎは　どこへいく？)
| [[アズリエル]]、『''UNDERTALE''』10周年記念配信イベントのエンディングより}}
'''『''UNDERTALE''』10周年記念配信イベント'''は、2日間にかけて行われた''[[UNDERTALE]]''<nowiki/>の[[記念日|10周年]]を記念して行われた寄付＆オークションイベントである。寄付は[[wikipedia:国境なき医師団|国境なき医師団]]に寄付され、合計で361,407.76ドルが集まった。また、配信イベントでは[[#視聴者参加|視聴者参加]]のイベントや[[#オークション|オークション]]が行われた。

この配信イベントは公式の[[メールマガジン]]や[[Toby Fox]]のSNSを通じて判明した<ref>{{Cite bluesky|author = tobyfox.undertale.com|id = 3lytntmhtes2n|text = For UNDERTALE's 10th anniversary, we are going to do 2 consecutive days of streams where we play through the game! The event will be run across two days at 4PM PT on September 20 and 21. You'll be able to watch it here. [https://undertale.com/10/ undertale.com/10/]|timestamp = 2025-09-14}}</ref>。[[メールマガジン#2025年秋号|2025年秋号のメールマガジン]]で、Toby Foxは''[[dr:DELTARUNE|DELTARUNE]]''<nowiki/> [[dr:Chapter 1|Chapter 1]]の[[dr:DELTARUNE#記念日|6th Anniversary Stream]]と似ている、と説明した。これは、Toby Foxの[[#開発|開発秘話]]に加え、[[#追加要素|追加要素]]として新たな[[#新しいNPC|NPC]]や[[#サウンドトラック|サウンドトラック]]があった。1日目には[[#実写|実写]]コーナーなどもあった。

== 歴史 ==
このイベントは開催数年前から検討されていたが、2024年末から本格的に始まった<ref name="everdraed">{{Cite bluesky|author = everdraed.bsky.social|id = 3lzkrw6mfuk24|text = I was creative lead for the UNDERTALE 10th Anniversary stream the event planning started in some ways years back, but in earnest 11 months ago I like making things for [https://bsky.app/profile/did:plc:vshnclkqqguyg6xcz6q7g65k @tobyfox.undertale.com] I like surreal nightmares I enjoyed mixing those together with many lovely, talented folks for [https://bsky.app/hashtag/UT10th #UT10th]|timestamp = 2025-09-23}}</ref>。

2025年7月25日にToby Foxはファンに、UNDERTALEに関する思い出を求めるという内容の投稿をし、''UNDERTALE''の公式サイトに思い出を投稿するリンクが共有された<ref>{{Cite bluesky|author = tobyfox.undertale.com|id = 3lutlvmicvc22|text = Hello. It's almost been 10 years since UNDERTALE released. Now, I'm looking for your memories. Let's turn back together. Face the flower and speak. [https://memories.undertale.com/ memories.undertale.com]|timestamp = 2025-07-25}}</ref>。そのサイトには[[エコーフラワー]]とカスタム可能な表情差分を作れるオプションがあり、合計40万件の応募が届いた<ref>{{Cite bluesky|author = tobyfox.undertale.com|id = 3luw77wud722z|text = We received over 400k submissions. Thank you. The form is now closed.|timestamp = 2025-07-26}}</ref>。

Toby Foxはテストプレイ中、''UNDERTALE''をクリアするのに8時間かかったと述べた<ref>{{Cite news|text = 試しにプレイしてみたら、8時間以上かかってしまって… なので、半分ずつに分けます。1日目に半分プレイして、残りは次の日に。|title = UNDERTALE/DELTARUNE通信（2025年秋号）|site = toby.fangamer.jp|url = https://toby.fangamer.jp/newsletters/autumn25/|timestamp = 2025-09-14|firstname = Toby Fox}}</ref>。配信イベント前にToby Foxが体調を崩したため、配信のセットアップにToby Foxが体調を崩して、頭が真っ白になり「毒を盛られたか」どうか判別できるボタンが導入され、[[うざいイヌ]]が緑色になっていた<ref name="poisoned">{{Cite twitter|author = UnderTale|id = 1969187183371116698|text = In case I start drawing a mental blank due to my recent illness / insomnia we have implemented a button into the stream set up that will be able to display when I'm poisoned}}</ref>。

配信イベントの開始前にToby FoxはXで[[キャラ|おちたニンゲン]]の[[なまえ]]について尋ね<ref>{{Cite twitter|author = tobyfox|id = 1968090229476298809|text = Hey guys, what name should we choose at the beginning of the game? (Name candidates must be 6 characters or less.)}}</ref>、選ばれた2つの有力候補は[https://knowyourmeme.com/memes/togore-dreemurr Togore(トゴア)]と[[キャラ|Chara(キャラ)]]だった。[[ガスター|Gaster(ガスター)]]と[[フリスク|Frisk(フリスク)]]も多くの支持を得ていたが<ref>{{Cite twitter|author = cvsilly_|id = 1968260308973343071|text = https://pbs.twimg.com/media/G1CqSzZWMAArIBC.jpg}}</ref>、この二つは[[なまえ#特殊演出|特殊演出]]があるため、実用的ではないとなった<ref>{{Cite twitter|author = tobyfox|id = 1969241715673358623|text = Get ready to fight for what you believe in. Which is stronger... TOGORE's love? Or does CHARA have the sheer numbers to win an underdog victory. (By the way, names with special effects do not work in this system, so we are not able to have them as candidates.)}}</ref>。チャリティーバトル中に、より多く寄付が集まった名前によって、[[セーブポイント]]で、CharaとTogoreにいつでも帰ることが出来た<ref>{{Cite twitter|author = tobyfox|id = 1969241370935074880|text = For this stream, we have a feature to let us to change the name at any SAVE POINT. The top name will be up to charity donations. If TOGORE fails to raise enough money, then the name will be changed to CHARA. People that prefer CHARA can also donate to try to defeat TOGORE.}}</ref>。TogoreはXで最も人気な選択肢だったが<ref>{{Cite twitter|author = tobyfox|id = 1969241042097524880|text = Regarding the name vote. TOGORE seems to have been the most popular option by a massive margin. The only other viable name candidate was CHARA. Therefore, will make TOGORE the default name. However, that doesn't mean that CHARA doesn't have a second chance...!}}</ref>、配信イベントの最初のチャリティーバトルの結果により、配信イベントは「Chara」で始まった<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 3844}}</ref>。

なまえは配信イベント中に何度も変わり、「Togore」は[[ウォーターフェル]]でキャラが言及されたときに変更され<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 12983}}</ref>、[[しんじつのラボ]]で再び「Chara」に戻り、その時に命名投票がスキップされ、その後ずっと使用された。また、一瞬だけなまえが[[dr:ポイン|Nubert(ポイン)]]になっていた時もあった<ref>{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 3869}}</ref>。イベント2日目は何度か、視聴者にCharaへの投票を促していた。

== クレジット ==
Many of the stream contributors are acknowledged via the Day 2 stream credits.<ref name="credits">{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 19373}}</ref> It is sorted roughly in a similar order as the end credits for the stream, including guest contributors.

[[File:Sans battle "Dr. Jogboy".png|thumb|Sans in his "Dr. Jogboy" attire.]]
It was directed by Toby Fox, who was also responsible for some music arrangements, new character and area designs, [[Sans]]'s "Dr. Jogboy" outfit, and the laughing walls in [[#True Lab|True Lab]].<ref name="note.txt">[https://undertale.com/10/ https://undertale.com/10/], from the "note.txt" file in 10thAnniversaryNewGraphics.zip.</ref> However, he did not create actual sprite art for the stream.

The stream was hosted by the three "Fangamer Dads":
* Reid Young, the executive producer and part of the Fangamer Stream Team,<ref>{{Cite bluesky|author = reidman.bsky.social|id = 3lyuvohydrk2g|text = been a while since we streamed! we’ve had a ton of people working on this and it’s gonna be fun 🙇‍♂️|timestamp = 2025-09-15}}</ref> who played with the [[#Auctions|Giant Toriel Plush]] during the stream and opens the door for [[3D Toriel]].
* Dan Moore,<ref>{{Cite bluesky|author = dpmoore.bsky.social|id = 3lzfjw2gnzc2o|text = A huge treat to once again be a Fangamer Dad. Thanks to everybody who watched and donated and to Toby for making a game that's a tractor beam for kind and interesting people (the best kind of game)|timestamp = 2025-09-21}}</ref> who briefly wears a commemorative Nubert tie,<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 5128}}</ref> and interacts with the Annoying Dog during the stream, such as petting.<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 6855}}</ref>
* Charlie Verdin, who was the primary [[player]] for the playthrough.<ref>{{Cite bluesky|author = charlieverdin.com|id = 3lzcdknai2k27|text = I'll be playing Undertale to raise money for Doctors Without Borders at 4pm Pacific today and tomorrow. We've somehow already raised several thousand dollars over an hour before we start, so I'm looking forward to seeing how much we raise once we actually start. Watch the stream at [https://undertale.com/10 undertale.com/10]|timestamp = 2025-09-20}}</ref>

Programming for the ''Undertale'' build for the stream was performed by "The Three Musketeers":
* [https://bsky.app/profile/beholdmaxine.bsky.social BeholdMaxine]: one of the directors and writers for [https://teamswitched.dev/ ''TS!Underswap''], as well as the creator of [https://gamejolt.com/games/ribbitmod/671888 ''RIBBIT''], a mod for ''Deltarune''.<ref>{{Cite bluesky|author = beholdmaxine.bsky.social|id = 3lzgal2jatc27|text = surprise! i was one of the musketeers who worked on the 10th anniversary project! i coded cutscenes, rooms, lots of all-over-the-place kinda stuff... my eternal thank yous go to Colin & Spasco for the smooth teamwork, and of course, Robert Sephazon & Toby Fox for giving us this wild opportunity!!|timestamp = 2025-09-22}}</ref> BeholdMaxine's largest contributions include the [[#Hotland 2|school sequence, bed lump]], [[#Snowdin 2|Dog Hole, and Spamton's scene]].<ref>{{Cite bluesky|author = beholdmaxine.bsky.social|id = 3lzgal2jatc27|text = amongst various things, my largest coding contributions were the school sequence, the bed lump scene (toby came up with the idea, but i begged the team to let me do it), dog hole room (very yume nikki inspired BG on that one), and the spamton scene.|timestamp = 2025-09-22}}</ref> Her happiest memory is of Toby retaining the dialogue and door sprite gag for [[#Waterfall 2|the scene in Undyne's house]].<ref>{{Cite bluesky|author = beholdmaxine.bsky.social|id = 3lzgal2jatc27|text = my happiest memory is of this gag. i asked if we could do something new here, and to my surprise, toby gave me the reigns to come up with whatever! i expected the dialog and the shoddy door sprite to get redone, but... he just... kept it as is! i made a proof of concept and it got left in unaltered|timestamp = 2025-09-22}}</ref>
* [[uty:Spasco|Spasco]]: a lead programmer for ''[[uty:Undertale Yellow|Undertale Yellow]]''.<ref>{{Cite bluesky|author = spasco.bsky.social|id = 3lzihpmz6yc2w|text =I am overjoyed that I was able to help program Undertale's 10th anniversary stream edition alongside BeholdMaxine and colinator27! Thank you to Toby, Fangamer and our producer Robert Sephazon for the opportunity, and everyone else who helped along the way.|timestamp = 2025-09-23}}</ref>
* [https://bsky.app/profile/colinator27.bsky.social colinator27]: a musician and lead programmer, also for ''TS!Underswap''.<ref>{{Cite bluesky|author = colinator27.bsky.social|id = 3lzfhj47in22i|text = So... yes! I, along with fellow musketeers Spasco and BeholdMaxine, helped program an UNDERTALE mod directed by Toby Fox himself, for a livestream... Huge thanks to Spasco and Maxine, along with our producer, Robert Sephazon, and Toby and everyone else on his team.|timestamp = 2025-09-21}}</ref>

All the Three Musketeers are also credited for new programming for the 10th anniversary battles hosted on the official ''Undertale'' website.<ref name="music battles">{{Cite twitter|author = tobyfox|id = 1969966329320091790|text = Amazing job, guys! Thanks to you we raised over $300,000 for Doctors Without Borders / MSF! You can access the unique music / battles from the 10th Anniversary on the bottom of this page. (Thank you to the 3 modding musketeers who made this possible!)}}</ref> Additional programming was done by [[dr:Fred Wood|Fred Wood]],<ref>{{Cite bluesky|author = fredtwood.com|id = 3lzfhkcrvmc23|text = It feels incredibly special to be included in this. Thanks y'all.|timestamp = 2025-09-21}}</ref> and he is credited for contributing to the pacifist battle versus Sans for the "Ask Sans To Go All Out" incentive.<ref name="ut10 battle">https://ut10-battle.undertale.com/</ref>

[[File:10th Anniversary Stream logo maracas.gif|thumb|One of the stream logos animated by Smallbu.]]
[[Temmie Chang]] contributed as the main artist.<ref name="note.txt" /> Other contributing artists include [[Kenju]], who created the [[#Hotland 2|Hotland buildings]],<ref name="note.txt" /> and [[Merrigo]],<ref>{{Cite bluesky|author = merrigo.bsky.social|id = 3lzhcno7d2k2v|text = UT Anniversary stream was so fun to watch 🥹. I had a lot of fun coming back to work on the special stream bits! Congrats to everyone involved and thank you for having me! If you found me here from the stream, hi! Please remember my final message...|timestamp = 2025-09-22}}</ref> who created the [[#Waterfall 2|Waterfall underwater parallax background]].<ref name="note.txt" /> [[dr:Smallbu Animation|Smallbu Animation]], who has created animations in ''Deltarune'' such as [[dr:Tenna|Tenna]]'s introduction cinematic and [[dr:Kris|Kris]] playing the piano, has created multiple versions of the animated 10th Anniversary logo for the stream.<ref>{{Cite bluesky|author = smallbu.bsky.social|id = 3lzhcno7d2k2v|text = It was our pleasure to animate the Undertale 10th anniversary logo for the stream! Here is a little thread showing the various versions. First is the normal one. Always excited when there is room to animate confetti.|timestamp = 2025-09-22}}</ref>

[[dr:Camellia|Camellia]] created the ''[[Wrong Number Remix]]'' upon Toby's request, which is further elaborated on in the description for the remix's video.<ref name="camellia">{{Cite bluesky|author = cametek.bsky.social|id = 3lzcxq3eoxf2b|text = I made an 8-second remix of WRONG NUMBER SONG (Camellia Remix) for Undertale 10th anniversary stream ☎ ... And here's the full remix! アンダーテール10周年配信に間違い電話の曲のリミックスを作ったよ！ [https://youtu.be/Ymex1MC7aDY youtu.be/Ymex1MC7aDY]|timestamp = 2025-09-20}}</ref><ref>{{Cite youtube|id = Ymex1MC7aDY|title = Wrong Number Song (Camellia Remix) [For Undertale 10th Anniversary]}}</ref> [[dr:Carlos Eiene|Carlos "insaneintherain" Eiene]], who has made the [https://insaneintherainmusic.bandcamp.com/album/live-at-grillbys Live at Grillby's] album, is credited for the music arrangement of the ''[[Song That Plays When Somebody Verses Sans]]'' track,<ref name="somebody versus sans">{{Cite bluesky|author = insaneintherainmusic.com|id = 3lzju7kmhqk2s|text = I made a performance video of one of the songs I arranged for the UNDERTALE 10th Anniversary - Song That Plays When Somebody Verses Sans! It was an honor to be asked to make this, and it was so much fun to put together! Happy 10 years of UNDERTALE! [https://www.youtube.com/watch?v=YQbHYAO2FoU www.youtube.com/watch?v=YQbH...]|timestamp = 2025-09-23}}</ref> as well as ''[[Snowed Inn Jazz]]'' and ''[[what's up?]]''.<ref name="snowed inn jazz what's up">{{Cite twitter|author = insanerainmusic|id = 1969974972170006997|text = Honored to not only have had my arrangements played as pre-stream music during the UNDERTALE 10th anniversary stream... but I also contributed a few custom music arrangements specifically made for the event!!}}</ref> [[dr:Marcy Nabors|Marcy Nabors]], who has also helped compose ''Deltarune''<nowiki/>'s ''[[dr:Attack of the Killer Queen|Attack of the Killer Queen]]'', did MIDI transcription for the ''[[Abandoned Town]]'' and ''[[Underwater Town]]'' tracks.<ref name="marcy nabors">{{Cite bluesky|author = shadolith.bsky.social|id = 3lzfi5pcplc2n|text = I did MIDI transcription for Abandoned_Town.wav & Underwater_Town.wav!|timestamp = 2025-09-21}}</ref> The intended credits for the intermission music were not functioning during the first day of the stream, but Toby credited them as fanmusic from the [https://underveil.unisphere.tv/ UNDERVEIL project]<ref>{{Cite twitter|author = tobyfox|id = 1969524766903283988|text = One more thing. The music playing on the pre-roll is fanmusic from the UNDERVEIL project. [https://underveil.unisphere.tv/ underveil.unisphere.tv] Unfortunately the credits aren't showing up correctly on stream! All credit goes to these talented guys though.}}</ref><ref name="ut underveil">{{Cite twitter|author = UT_UNDERVEIL|id = 1969577711825011040|text = ありがたいご縁があり、Undertale 10周年記念配信のBGMとしてUNDERVEILシリーズのアレンジ楽曲をご利用いただいております。 みなさん是非配信をご覧ください！}}</ref> and arrangements from Carlos Eiene.<ref>{{Cite twitter|author = tobyfox|id = 1969527682594717718|text = OK, the saxophone music is @insanerainmusic though.}}</ref><ref name="snowed inn jazz what's up" /> See also: [[#Intermission tracks|intermission tracks]] for the full tracks and credits list.

[[dr:Robert Sephazon|Robert Sephazon]] was the producer, and conceptualized the Memories project with Fangamer.<ref>{{Cite bluesky|author = sephazon.bsky.social|id = 3lzfiycm2ac2q|text = I am honored to have been the producer for the UNDERTALE 10th Anniversary special stream version. It was as fun to work on as it was to watch, thanks to the three musketeers and [https://bsky.app/profile/did:plc:vshnclkqqguyg6xcz6q7g65k @tobyfox.undertale.com]! I also conceptualised the UNDERTALE Memories project with [https://bsky.app/profile/did:plc:bxcle5czdiwqueyanwuwuhse @fangamer.com]. Stay determined!|timestamp = 2025-09-21}}</ref> [https://bsky.app/profile/redco.in Brian Coia], part of the Fangamer Stream Team, assisted on stream and website tech and the Memories project.<ref>{{Cite bluesky|author = redco.in|id = 3lzfl3evhvk2r|text = i was responsible for the UNDERTALE 10th Anniversary stream tech and memories project. truly thankful to be part of something so important to so many, even as a humble internet janitor|timestamp = 2025-09-21}}</ref> Brian synced the text-to-speech with the [https://www.fangamer.com/collections/undertale/products/undertale-annoying-dog-plush Annoying Dog plush's] mouth,<ref>{{Cite bluesky|author = redco.in|id = 3lzfqijt7z22l|text = there are a million things i want to talk about, but instead i'll first take credit for the latest in IRL vtuber tech, the synced TTS dog mouth|timestamp = 2025-09-21}}</ref> and recreated the Echo Flowers room that is used for the Memories pre-stream/intermissions.<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 14700}}</ref>

[https://bsky.app/profile/wayneradio.tv wayneradiotv], part of the Fangamer Stage Team, reprised his role as [[dr:Spamton Sweepstakes#SPAMTON VALUE NETWORK|Spamton A. Spamton]] from the [[dr:Spamton Sweepstakes#Fangamer livestream|Fangamer livestream]]s.<ref>{{Cite twitter|author = wayneradiotv|id = 1969618419801866560|text = Shh… tell anyone… but something might’ve happened today… [https://twitch.tv/videos/2571574915?t=9831s twitch.tv/videos/2571574…] Spamton might send his regards… thank you to [https://twitter.com/tobyfox @tobyfox] for something….}}</ref> Wayne was also a camera operator the entire time while in his Spamton A. Spamton attire.<ref>{{Cite bluesky|author = wayneradio.tv|id = 3lzfpnfwxxa2i|text = yes i was behind the camera like that the entire time. thank you [https://bsky.app/profile/did:plc:bxcle5czdiwqueyanwuwuhse @fangamer.com] for the awesome opportunity and for raising over 323k kromer !!! wat an amazing week…|timestamp = 2025-09-21}}</ref> Señor Romero Piñatas created the 7ft tall 3D Toriel piñata that appears during a [[#Live action|live-action segment]].<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 19804}}</ref> She was made from newspaper, water, flour, and cardboard,<ref>https://www.instagram.com/p/DO2kgkfjGwe/</ref> and was the largest piñata Señor Romero Piñatas has made as of September 20, 2025.<ref>https://www.instagram.com/p/DO2YI75EbD7/</ref>

The Fangamer staff also includes:
* Stream Team: [[Everdraed]] as the creative lead, who had been part of the planning for the event for years.<ref name="everdraed"/> He at some point drew a different version of the logo with a concert piano at a different angle, though it exposed the "''ultra realistic piano-playing hands''".<ref name="ultra realistic">{{Cite bluesky|author = everdraed.bsky.social|id = 3lzkse25sds24|text = Audrey made the final [https://bsky.app/hashtag/UT10th #UT10th] logo, and the JP concert logo. I wanted to see the concert piano at a different angle so I MSPainted it, but that exposed the hands. the ultra realistic piano-playing hands. I am sorry. but they have no pain...|timestamp = 2025-09-23}}</ref> Everdraed appears on the set on the second day, acknowledges [[Omega Flowey]]'s name, expresses his thoughts on the battle, and his experience with the [[Undertale Demo|''Undertale'' Demo]].<ref>{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 8155}}</ref> Nathan Cranford is credited a project manager.
* Stage Team: Steve Campos as the director, Mike Stimpson as another camera operator, Brittney Olsen and Aaron Cargile as producers, and Dylan Browne for audio tech.
* Design Team: [https://bsky.app/profile/metroidhat.bsky.social Eyes5] as the plush designer,<ref name="eyes5">{{Cite bluesky|author = metroidhat.bsky.social|id = 3lzcn7kwld22g|text = Are y'all watching the Undertale 10th anniversary stream? [https://undertale.com/10/ undertale.com/10/] I made the big Toriel up for donation! It is basically a bigger version of the small Toriel plushie available for sale from Fangamer. You can win her if you donate a bunch!|timestamp = 2025-09-20}}</ref> [https://bsky.app/profile/meeellla.bsky.social Camille Young] as the diorama designer,<ref name="camille young">{{Cite bluesky|author = meeellla.bsky.social|id = 3lzcdkqfy422x|text = I made a diorama that will be auctioned as part of the undertale 10th anniversary stream: [https://undertale.com/ undertale.com] The auction starts today and ends tomorrow, and 100% of the proceeds will go to Doctors Without Borders / MSF.|timestamp = 2025-09-20}}</ref> and for Fangamer support is [[dr:Chess|Chess]] and the Fangamer Volunteer Mod Team.
* Art Team: Sara Luu, Lorenzo Vissichelli, Danny Picou, Danny McGee, Morgan DiFede, Cass Robinson, Michael Ferguson, Angela Phelps, Derek Carmody, Marcos Rosas, Joelle Blot, Heidi Mandelin, and [[dr:Audrey Waner|Audrey Waner]], who made the final 10th Anniversary logo.<ref>{{Cite bluesky|author = shapemover.bsky.social|id = 3lzpl4k36jk2c|text = I designed the logo for the Undertale 10th Anniversary and, to my surprise and delight, SmallBu animated it!! three times!!!|timestamp = 2025-09-25}}</ref><ref name="ultra realistic"/>

Special thanks was given to the ''UNDERTALE'' modding community, and the stream's viewer.

== Development ==
{{Stub|reason= entire second half of stream 2 not summarised here (New Home 2, True Lab, Asriel boss fight)}}
Information revealed pertaining to ''Undertale''<nowiki/>'s development, and some of ''Deltarune''<nowiki/>'s.

=== Ruins ===
Several aspects of the [[Ruins]] were inspired by the game [[wikipedia:Brandish (video game)|''Brandish'']], including the area's name, its puzzles, and the plaques on the walls.<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 4094}}</ref> The music of the Ruins was inspired by [[wikipedia:Secret of Mana|''Secret of Mana'']].<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 4212}}</ref>

[[Toriel]]'s speech is intentionally written to avoid using contractions, which Toby describes as "her special super duper [[wikipedia:Homestuck|''Homestuck'']] typing quirk". Toriel's appearance was inspired by the [[cavestory:Mimiga|Mimiga]] from [[cavestory:Cave Story|''Cave Story'']], which Toby said "everyone knows", including the creator of ''Cave Story'', as Toby had personally told him. Toby also describes how Toriel was originally intended to have a more humanoid appearance and be "some kind of motherly goddess", noting that this idea was "too close to [[wikipedia:Breath of Fire III|''Breath of Fire 3'']]".<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 4316}}</ref>

Several of ''Undertale'''s characters were named based on results from a random English word generator website, including [[Napstablook]] and [[Asgore]].<ref name="ruinsblook">{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 4616}}</ref>

''[[Ghost Fight]]'' was originally made for a compilation of [[wikipedia:Super Nintendo Entertainment System|Super Nintendo]]-styled music. As a fan of the game ''[[wikipedia:Off (video game)|OFF]]'', which includes a jazz-like song that plays while fighting ghost enemies, Toby felt that assigning a ghost character a jazz song would be a fitting combination. Toby does not think Napstablook as a character has anything to do with jazz, though.<ref name="ruinsblook" />

[[Froggit]] was intentionally designed to have a confusing appearance, with it being ambiguous whether the second face is part of a single Froggit, or if it is a separate creature that hides under it.<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 4714}}</ref>

Due to the existence of [[Flowey]], plant-based [[monster]]s were usually avoided. The notable exception to this is [[Vegetoid]], which Toby claims was included as he "was afraid the player wasn't going to get enough Vitamin A". He then says that Vegetoid is "technically not really a plant anyway", rather being a monster that looks like one, though he adds that this is how he personally sees it. Toby recalls that it was impossible to spare Vegetoid without attacking it in the game's demo, which he now realizes was "not great design".<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 4808}}</ref>

[[Loox]] was the first enemy in the game to be designed by Temmie Chang.<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 5013}}</ref>

A major motivation for the direction of Toriel's character was that Toby wanted to create a mother character "that was actually a character beyond being a mother". He cites his own dissatisfaction with the handling of a [[Earthbound:Hinawa|mother character]] in [[earthbound:Mother 3|''Mother 3'']] as inspiration for this.<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 5554}}</ref> Later in the stream, Toby discusses how one of his friends criticized Toriel for being what they deemed a "perfect" character, as they did not feel she had flaws beyond being "too nice". This encouraged Toby to show more of Toriel's flaws over time, as he feels it is important for characters to have imperfections to give them depth.<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 9746}}</ref>

=== Snowdin ===
The characters of Sans and [[Papyrus]] were inspired by Toby's friend [[J.N. Wiedle]], also known as Jones, who loves skeleton characters. As Jones's webcomic ''Helvetica'' centers around a skeleton named after a font, Toby made skeletons named after "the most annoying fonts of all time" as a reference to said webcomic. Toby notes that at the time ''Undertale'' was being developed, expressing exaggerated hatred for the Comic Sans and Papyrus fonts was a popular meme, and that he finds it funny that this joke has lost popularity since the game came out.<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 5932}}</ref>

Toby describes the fundamentals of his sense of humor as coming down to "two wacky guys". This approach goes as far back as when he was five years old, and would play pretend by making his left and right hand into different characters who acted as comedic foils to each other.<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 6049}}</ref>

[[File:Sans screenshot introduction Japanese.png|thumb|Sans using the ハッピールイカ (''happī ruika'', "HappyRuika") font in the Japanese version of ''Undertale''.]]
At some point in the Japanese translation's development, Sans was intended to use the "Poptai" font (likely referring to [https://www.myfonts.com/collections/hg-soei-kakupoptai-font-ricoh/ Soei Kakupoptai]) though this did not come to pass. Toby does not remember the actual font used in the final translation,<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 6208}}</ref> which is the ハッピールイカ (''happī ruika'', "HappyRuika") typeface.

''[[sans.]]'' was originally created for an early version of ''Deltarune'', where it would have played in a gym in [[dr:Card Castle|Card Castle]] where several [[dr:Rudinn|Rudinns]] would be working out, with one saying that "''the brain is the strongest muscle of all''". According to Toby, this scene was intended as a reference to a gym in [[wikipedia:Space Funeral|''Space Funeral'']].<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 7147}}</ref> This original context is presumably the reason the track is internally referred to as <code>mus_muscle</code>.

''sans.'' was directly inspired by the song [https://youtu.be/PGAPeGd9zBs ''In and Out Crowd''] from ''[[wikipedia:Sesame Street|Sesame Street]]''. Toby explains that [[dr:Kanotynes|Kanotynes]], the artist behind the designs that inspired ''Deltarune'', is a fan of the work of animator [[wikipedia:Sally Cruikshank|Sally Cruikshank]], which led Toby to watch all of Cruikshank's animations. Upon watching the ''In and Out Crowd'' animation, Toby decided to make a homage to the song to practice music. He says that he felt the reference was very obvious, and that he was surprised to never see it pointed out by the fanbase, though Reid's son apparently identified the similarity to ''Sesame Street'' immediately.<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 7352}}</ref>

Toby states that the reason for the abundance of dogs in ''Undertale'' was Temmie liking dogs, and reveals that he actually prefers cats. Around the time of ''Undertale''<nowiki />'s development, Toby was "all about Pomeranians" due to Temmie having a pet Pomeranian named Kibble. He recounts a frequent joke of his where he would say he had concept art to send Temmie, and instead send her the same photo of a Pomeranian, and that eventually this joke turned into editing the Pomeranian to be longer. Toby believes this story is the reason that [[Lesser Dog]] was added to the game, but is uncertain as it had happened twelve years ago.<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 6344}}</ref>

Toby seems to confirm that the [[Mettaton]]-like machine used by Papyrus to activate the [[Multicolor Tile Puzzle]] is, in fact, Mettaton himself. However, the on-screen captions show that he typed several question marks while saying so, which may indicate he is uncertain about this.<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 7332}}</ref>

Temmie drew several more parts of [[The Gauntlet of Deadly Terror]] that were not used. Toby also says that the Annoying Dog dangling from a rope in said scene is his favorite graphic in the game.<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 7847}}</ref>

Toby says that ''[[Snowdin Town (soundtrack)|Snowdin Town]]'' is one of the only songs in the game that he is able to play on the piano and still have it sound good, though he does clarify that all the game's songs were initially composed on the piano.<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 7955}}</ref>

Toby does not remember how he made the image used for the fog before Papyrus's boss battle, only that it was "something that got mirrored".<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 8391}}</ref>

Toby reveals that ''[[Nyeh Heh Heh!]]'' was originally composed as [[dr:Lancer|Lancer]]'s theme in a 2012 concept for ''Deltarune''. He calls this "famous" information despite having never shared it before. He also repeats that ''[[Bonetrousle]]'' was originally made to be ''Deltarune''<nowiki />'s normal encounter theme, which he had already stated in several other sources before the stream.<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 8473}}</ref>

=== Waterfall ===
Waterfall is the first area in the game to have tiles created by Kenju, who also created the tiles for [[Hotland]].<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 11749}}</ref>

Toby says that [[Loren]]'s original concept, as thought of by [[Kickstarter]] backer Colin MacDougall, was that of "a guy that wants to eat everything", though he admits he does not remember the details of the concept well, joking that Loren ate his memories of the event.

Upon reaching the battle with the [[Mad Dummy]], Toby mentions that he had wanted to include a consequence for the player's actions in the initial encounter with the [[Dummy]] from the very beginning, and says that it was fun to remix ''Ghost Fight'' to create ''[[Dummy!]]''.<ref name="dummy+grid">{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 13141}}</ref>

Toby shares some information about the grid background in encounters at Reid's request, stating that the original intent was for monsters to always be aligned to the grid, though Toby is unsure if he kept doing this in later areas. He also reveals that the grid's color was intended to change depending on the current area, as opposed to always being green as it is in the final game. Toby says that he planned to have this happen in ''Deltarune'' as well, but once again forgot to include it.<ref name="dummy+grid" />

Some of Napstablook's traits were inspired by a friend Toby had in college, who he has not spoken to for many years since. Toby says he does not know if that friend liked being "part of the Napstablook recipe", but he hopes that he does, since "otherwise it would be really weird".<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 13440}}</ref>

In [[Temmie Village]], Toby states that [[Temmie]]'s speaking style was inspired by how Temmie Chang used to type at the time of ''Undertale''<nowiki />'s development, which was previously shared in an interview with Temmie from the [[ISSUE 2 - Spring 2023]] Newsletter. He states that Chang has since stopped typing this way, saying that he searched his chat history with her over the past 4 years and there were no results for "hoi", which she once said often. He recounts that Chang had mixed feelings about being heavily associated with the Temmie character from ''Undertale''.<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 14203}}</ref>

Toby describes that while he wanted ''Undertale'''s characters to feel like real people and put great effort into conveying their personalities, he has created each character with a specific purpose in the game's narrative. He then explains the primary intent behind certain [[:Category:Main characters|main characters]]: Flowey was created to introduce the game's conflict of violence versus mercy, Toriel was made to test the player's trust after being tricked by Flowey and demonstrate the impact of their choices, Papyrus is intended to be a character that is "nearly guaranteed to be your friend", and [[Undyne]] is supposed to be the first character that cannot be spared in the same way as the game's encounters up until that point. All of these characters present different ways of exploring the story through the game's mechanics, and each character evolved to have more depth past their initial role as he continued to write the story.<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 14544}}</ref>

Reflecting on people asking him how he makes his characters, Toby states his belief that the most important element to making good characters is to make a story for them to have purpose in: "Purpose and function first, personality etc. later."<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 14624}}</ref>

Toby repeats that he had not known what Undyne's personality would be until he began writing the cutscene immediately before her [[Undyne/In battle|boss battle]], saying that a large part of her characterization was made up last minute at that point. Undyne was at one point intended to have "some sort of serious British knight accent", which Toby compared to the character [[chrono:Frog|Frog]] from [[chrono:Chrono Trigger|''Chrono Trigger'']], and was intended to be a much more serious character than the rest of the cast. Toby expresses that he feels like it was for the better that Undyne's character ended up being "a little bit goofy".<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 14890}}</ref>

[[File:Undyne screenshot sushi Japanese.png|thumb|スシの　ニオイがする。 (''Sushi no nioi ga suru.'', "Smells like sushi.")]]
Toby requested that the "''Smells like sushi.''" flavor text in the battle with Undyne be kept unchanged in the Japanese translation, despite the fact that the word "sushi" simply refers to vinegared rice in Japan, rather than the association with raw fish the term often has in English-speaking countries. He says that while it could have been changed to refer to something that would have maintained the connection with fish, such as [[wikipedia:Sashimi|sashimi]], he considered the original line "too famous" to alter at the time. After explaining this, Toby repeatedly attempts to credit [[dr:Keiko Fukuichi|Keiko Fukuichi]] for the game's Japanese translation, which he does in Japanese; however, this can only be seen by translating the on-screen subtitles, since his text-to-speech program does not support the language and fails to read most of the sentence.<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 15026}}</ref>

When designing the game's battle systems, Toby tried to choose mechanics that would be intuitive even if the player was unfamiliar with any given genre. He compares the green [[SOUL mode]]'s mechanics to rhythm games, saying that it is "probably easy as pie" for those who are good at such games.<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 15171}}</ref>

=== Hotland ===
[[File:Dog food bag overworld.png|thumb|Dog food drawn by Clairvoire.]]
By the time the game reached this point in development, Temmie was very busy with school, so much more artwork had to be created by Toby or other artists.<ref name="alphyslabcredits">{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 16266}}</ref> [[dr:Clairvoire|Clairvoire]] drew the bag of dog food in [[Alphys]]'s [[Lab]],<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 16276}}</ref> the outer facade of the [[MTT Resort]],<ref>{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 3956}}</ref> and the sprite for [[Mettaton EX]]'s Happy Breaktime "attack".<ref>{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 6108}}</ref> Toby drew many of the graphics in Alphys's lab, which he states to be the reason for any perceived faults in them.<ref name="alphyslabcredits" />

Alphys's name in the Japanese translation is instead "アルフィー", or "Alfie", which was Toby's own suggestion. He says that he was not aware of the existence of the Japanese band [[wikipedia:The Alfee|The Alfee]] at the time, and expresses slight regret over this, as he wanted the names of his characters to be unique to make it easier to search for them.<ref name="alfee+xan">{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 16362}}</ref>

Alphys's voicebyte is a clip of [[dr:Deltarune developers#Xan Wetherall|Xan Wetherall]]'s voice. Xan would later become part of the development team of ''Deltarune''<nowiki/>'s [[dr:Chapter 2|Chapter 2]].<ref name="alfee+xan" />

Mettaton was apparently included in the game in order to appeal to Toby's friends who are fans of [[wikipedia:Transformers|''Transformers'']]. Toby also alludes to the concept of an "electric game show host" being inspired by the character of Bob Sparker from [https://electricopolis.net/characters/ ''Tales from Electricopolis''] by [[Pauli Kohberger]], as is stated in the game's end credits, though he does not name him or ''Tales from Electricopolis'' directly during the stream, and simply refers to "(his) friend Moon's character". Toby summarizes the intent behind Mettaton as "trying to make fanservice for Jones".<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 16402}}</ref>

Alphys's main visual inspirations were [[mspa:John Egbert|John Egbert]] from ''Homestuck'', [[wikipedia:Lisa Simpson|Lisa Simpson]], and "[[mariowiki:Francis|that lizard guy]] from [[mariowiki:Super Paper Mario|''Super Paper Mario'']]", though Toby admits that he has never played said game.<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 16520}}</ref>

The song ''[[Another Medium]]'' was originally composed for ''Homestuck'', but was not used in the comic, leading Toby to repurpose it for ''Undertale''.<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 16762}}</ref>

[[Tsunderplane]]'s hat is based on that of [[touhou:Yukari Yakumo|Yukari Yakumo]] from the [[touhou:Touhou Project|''Touhou Project'']] series. The bug where Tsunderplane shrinks into the top-left corner upon being spared was intentionally left in the game, as Toby found it funny.<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 16785}}</ref>

Several unused sprites of scrapped monster NPCs drawn by [[Cap]] are shown while the hosts trek through Hotland, including a "green radioactive fox" who would have skateboarded into the lava and died.<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 16999}}</ref> This character was scrapped, and the Annoying Dog was invented as an avatar for Toby instead.

[[File:Cooking show logo overworld Japanese.png|thumb|さつじんロボのキラキラキッチン (''satsujin robo no kirakira kitchin'', "Killer Robot's Sparkling Kitchen").]]
The Japanese version of the "Cooking with a Killer Robot" logo was drawn by Hato Moa, who is best known as the developer of the visual novel [[wikipedia:Hatoful Boyfriend|''Hatoful Boyfriend'']] and is one of ''Undertale''<nowiki/>'s earliest Japanese fans. The English version was drawn by Toby himself.<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 17111}}</ref>

Hotland was intended to have more robotic NPCs inhabiting it. However, it was decided that Mettaton being the only robot would be better for the story, as he would be more unique.<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 17627}}</ref>

In addition to [[Royal Guards|RG 01 and RG 02]], who appear in-game, and the unused [[RG 03 and RG 04]] who remain in the game files, an additional pair of Royal Guards was planned. Toby had thought of "insane evil situations" that would occur when the Royal Guards were killed, such as a situation where upon one enemy's death, the other would inhale their dust and have a panic attack as a result. A friend Toby told about this idea did not like it at all, leading him to scrap it. He believes this was for the best, as the concept was "too edgy".<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 17813}}</ref>

Toby shared several early enemy ideas for Hotland, most of which went unused. The exceptions were Temmie, who instead appeared in Waterfall, and "Tsunder IV" and "JF-17 Tsunder", which appear to have been early names for Tsunderplane. One listed enemy, "Sweltering Snowman", would have been a reference to a fake [[Earthbound:EarthBound|''MOTHER 2 / EarthBound'']] enemy invented as a joke by Reid Young in the early days of the Starmen.net forums.<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 18667}}</ref><ref>{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 5410}}</ref>

Toby acknowledges that [[Muffet]] is considered by many to be one of the most difficult bosses in ''Undertale'', and recalls nerfing her several times after the game's release.<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 18869}}</ref> He also states that the "up next" sign for her attacks was inspired by [[kirby:The Arena|The Arena]] from [[kirby:Kirby Super Star|''Kirby Super Star'']].<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 18965}}</ref> The [[bullet board]] moving up and down during some of Muffet's attacks was accomplished by copy-and-pasting regions of the screen in a "very inefficient manner", which impacts the game's performance on older computers.<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 18992}}</ref> The sprites for Muffet's pet were cleaned up by [[Chess]].<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 19090}}</ref>

The musical segment with Mettaton was originally going to have a system where Mettaton would have different dialogue reacting to [[Frisk|the protagonist]]'s behavior as he danced with them. The strings for this still exist in the game's files.<ref>[[tcrf:Undertale/Unused_Text/Hotland#Slow-dance with Mettaton|Undertale/Unused Text/Hotland - The Cutting Room Floor]]</ref> Toby does not remember whether this idea was scrapped due to feeling "weird" or a bug resulting in the dialogue not showing up. The [[Xbox]] port of the game initially contained a glitch where this dialogue suddenly showed up, which greatly confused Toby, as there was no discernible reason in the code for this to happen.<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 19171}}</ref>

It was once planned for the MTT Resort to contain a small area which would have been a "giant bed field", accessible via the elevator. The area itself would have contained monsters in cryostasis waiting for the [[barrier]] to be broken, several "bed lumps" and NPCs who would be sleeping or talking about their dreams. The background music for the area would have been slowed-down and reversed, along with an effect resembling falling snow. The intent of the area was to show to show how many people were waiting to be freed. Toby eventually decided he did not like the idea, so the concept was scrapped.<ref>{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 4113}}</ref>

The resort was also planned to include an arcade area, where the protagonist would be able to play games while [[Monster Kid]] provided commentary. At one point, the protagonist was intended to play "Egyptian rat fink" with Sans, which may be another name for or variation of the card game [[wikipedia:Egyptian Ratscrew|Egyptian Ratscrew]]. This was cut due to being too difficult to program, though Toby implies that Sans's presence at the [[Dog Casino]] in the game's Xbox ports may have been in reference to this scrapped concept.<ref>{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 4169}}</ref>

While writing [[Burgerpants]]'s dialogue, Toby had no idea what dialogue to write for a shopkeeper, leading him to "let [his] own desperation take over". Toby acknowledges a now-patched bug where a placeholder message referencing ''[[wikipedia:The SpongeBob SquarePants Movie|The SpongeBob SquarePants Movie]]'' would appear if he was spoken to under certain conditions. Toby also describes the dialogue about the [[Nice Cream guy]] and Mettaton that was added in [[Version differences|v1.001]] to fix this bug as "fanservice".<ref>{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 4710}}</ref>

The graphics for the bridge to the [[CORE]] were designed by [[Gigi D.G.]] and drawn by Chess,<ref>{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 4962}}</ref> while the interior once again had tiles drawn by Kenju, and the area's concept art was drawn by Temmie. The CORE was originally planned to be a much larger and more difficult area, but after making five enemies, Toby decided that they would provide enough variety for the area.<ref>{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 4994}}</ref>

It was once planned to be possible for the protagonist to "marry" Mettaton, similarly to being able to "date" Papyrus, which Toby recalls had previously been mentioned during the game's Kickstarter campaign. Mettaton would have accepted the proposal, but only as a fake photo op to promote himself in tabloids. Toby eventually lost interest in this idea and felt like it no longer fit in the game, so it was scrapped.<ref>{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 5064}}</ref>

While the hosts proceed through the CORE, Toby shows a document containing a list of armors and weapons that he had thought of before coming up with a consistent theme for them. Some of the armors in the list include "Papyrus Armor", "Cyber Jammies", and "Asriel's Shirt".<ref>{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 5232}}</ref> He also shows a screenshot of a document that simply includes a name and description for a "Wormostat" [[item]], the intended purpose of which is unclear.<ref>{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 5288}}</ref> A few minutes later, he shows alternate concepts for weapons and armor that were made after he had settled on the theme of the [[Eight humans|previous fallen humans]]. These concepts include a scout who would have been represented with hiking boots as a weapon and a merit badge as armor, and a naturalist whose items would have been a bug net as a weapon and a flower crown as armor.<ref>{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 5482}}</ref> He also shares the script for a scrapped cutscene where Papyrus would call in to Mettaton's quiz show to help the protagonist.<ref>{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 5530}}</ref>

While working on the boss battle with Mettaton EX, Toby was concerned about the level of difficulty. Because of this, he created a separate program that only contained the battle, which he gave to some of his friends to observe how many tries it took them to win.<ref>{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 5756}}</ref> Toby considers Mettaton EX to have been the most difficult battle in the game to create in terms of attacks, as the yellow SOUL mode took more effort to think of new gameplay for than the other modes. On the other hand, Toby found creating the [[ACT]]s and point system fun to make, and enjoyed adding different ways to obtain points.<ref>{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 6082}}</ref>

Mettaton EX's unused dialogue portraits, which show a more robotic-looking side of his face,<ref>[[tcrf:Undertale/Unused Graphics#Unused Monster Dialogue Portraits|Undertale/Unused Graphics - The Cutting Room Floor]]</ref> were intended to be used after his defeat. Toby changed his mind about this, but the concept was repurposed for [[Mettaton NEO]]'s design.<ref>{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 6122}}</ref>

=== New Home ===
The track ''[[Undertale (soundtrack)|Undertale]]'' was inspired by the song ''[https://youtu.be/1VG5rb96nXk REDLINE DAY]'' from the movie ''[[wikipedia:Redline (2009 film)|REDLINE]]''. Toby notes that the song's lyrics unintentionally align with the narrative themes of ''Undertale'', quoting the lines "''You are the flower, I'm the rain/Without you, life is not the same''". Toby also cites the song ''[https://youtu.be/7zMZtHOEpXg Pneuma]'' from the soundtrack of the live-action ''[[wikipedia:Solanin|Solanin]]'' film as an inspiration for the track, saying it might have been a bigger inspiration than ''REDLINE DAY''.<ref>{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 6638}}</ref>

The starting melody of ''[[ASGORE (soundtrack)|ASGORE]]'' was inspired by ''[https://youtu.be/GpVOjYty8kk The Fog]'' from the game ''[[wikipedia:Persona 4|Persona 4]]'', to the point where one of Toby's project files that only contains the initial melody is called <code>persona4.FLP</code>.<ref name="asgorebattle1">{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 7511}}</ref> The version of ''ASGORE'' in the original project file is said to be "massively" faster than the in-game version; Toby deliberately sped up the track so that it would sound good when slowed down.<ref>{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 7601}}</ref> The track ''[[Determination (soundtrack)|Determination]]'', and by extension its leitmotif that is present in ''ASGORE'', was inspired by the Game Over music from ''Brandish''.<ref name="asgorebattle2" />

The inspiration for the [[Game Over]] screen foreshadowing Asgore came from the game ''[[wikipedia:Final Fantasy Legend II|Final Fantasy Legend II]]'', where the character Odin can revive the player's party if all characters are defeated in battle, in exchange for having to battle him at a later point in the game. Other inspirations for Asgore include the final boss of ''Brandish'', who is also a king the player must defeat to leave that game's underground world, and Amon from [[wikipedia:Lufia II: Rise of the Sinistrals|''Lufia 2'']], who inspired the design of Asgore's golden armor.<ref name="asgorebattle2">{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 7624}}</ref>

The battle with Asgore was designed to be difficult, but still possible for players unfamiliar with bullet hell games. In service of this, several features were implemented to make the battle easier. Asgore's attacks were made to always leave the protagonist at 1 HP if their HP is higher than 1, meaning that equipping the [[Stained Apron]] will always allow them to survive another hit after its HP recovery. There are also several means by which Asgore's defense can decrease, including the [[Butterscotch Pie]] and his defense dropping every turn after the twentieth turn. In addition, the [[Bisicle]] item was designed to be intentionally "super useful/broken" while playing through the [[True Pacifist Route]].<ref name="asgorebattle1" />

=== Omega Flowey ===
During the battle against Omega Flowey, Everdraed appears on the stream to discuss his contributions. Everdraed describes the experience of putting Omega Flowey together as being "scary in itself", but also says that being able to contribute to the game was very meaningful to him.<ref>{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 8248}}</ref>

Toby details how the point of the Omega Flowey battle is to make the player feel "overwhelmed and hopeless" at first, to the point where one might conclude that the battle is impossible and is indeed the end of the game. One technique used to achieve this was the HP decreasing by a disproportionate amount when the protagonist is hit at high HP, but with very little damage being taken when HP is low, giving the illusion of the attacks being unfair while ensuring it is still possible to win.<ref>{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 8340}}</ref>

Toby implies that the human face that appears on Omega Flowey's TV screen is his own face, and explains that the high contrast monochrome effect was achieved through exploiting a bug in an early version of [https://blog.loveconquersallgames.com/post/64940265113/so-this-is-a-thing-that-im-working-on-right-now Christine Love's Super Game Girl Camera] application where the image contrast could be set to a negative number, creating a strange effect.<ref>{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 8378}}</ref>

Toby explains that due to the amount of large graphics in the battle, he worried that it would increase the compile time of the game project. Because of this, he created an entire separate project to program the boss in, which was incorporated into the rest of the ''Undertale'' game project upon completion. This is the reason for the game's files including duplicates of several basic assets.<ref name="omegafloweydev1">{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 8415}}</ref>

Toby initially created the boss with placeholder graphics, and programmed a method for it to be possible to replace the graphics at runtime. This was done so that Everdraed could see his assets in the game immediately as he was working on them.<ref name="omegafloweydev1" />

In the stream, Toby also takes this battle as an opportunity to talk about how he intentionally had some of ''Undertale''<nowiki />'s sounds in general use a low-quality version of the .wav format, expressing that the compression and distortion added character to the sounds, and that he feels it suits the aesthetics of his games to not sound entirely "clean". He also thinks it was fun to try to get the game to have a small file size.<ref name="omegafloweydev1" />

At the time he made the assets for Omega Flowey, Everdraed had only seen the Ruins, having contacted Toby to ask if he wanted help after playing ''Undertale'' Demo. Due to this limited context, he was "blown away" by how different the experience of the full game had been from what he expected when he was working on Flowey's assets, and expresses pride at his work in the battle being the "punchline" of the game.<ref>{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 8492}}</ref>

Toby confirms that the synth preset used for the lead instrument in ''[[Your Best Nightmare]]'' is "Pad - Freak Choir" from the "Ultimate Sytrus" preset pack for FL Studio, and expresses an interest in synth presets that are "useless for any sort of normal songs".<ref>{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 8562}}</ref>

Notably, both Toby and Everdraed consistently refer to this form of Flowey as "Omega Flowey" during this section of the stream, arguably canonizing what has long been considered a fan name.

Toby implies that Sans's mandatory [[Cell Phone]] call at the end of the Neutral Route is inspired by the post-credit scene of ''[[wikipedia:Metal Gear Solid 2: Sons of Liberty|Metal Gear Solid 2: Sons of Liberty]]''. He also claims to have drawn inspiration for "meta elements" in ''Undertale''<nowiki/>'s battles from the same game.<ref>{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 8867}}</ref>

== Additions ==



The build of ''Undertale'' played on the stream has several unique additions. According to Toby, these details will remain exclusive to the anniversary event,<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 5302}}</ref> with their canonicity being left to the viewer's interpretation.<ref>{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 17425}}</ref> Such changes include new locations, music, dialogue, and cameos or allusions to ''Deltarune'':

=== General ===
* A "Naming" option was added in the SAVE Point menu for changing the name of the fallen human.<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 4031}}</ref>

=== Ruins ===
[[File:Home location 10th anniversary stream.png|thumb|The center of Home.]]
* The eastern [[Ruins]] balcony stretches further to the right than usual, ending at a set of stairs that descend into [[Home]]. The [[Delta Rune]] appears atop an entryway with its triangles inverted, similarly to its depiction on the windows in the [[Last Corridor]]. Opposite of the entryway are some buildings and a statue resembling Toriel at the center of the area. The [[Toy Knife]] is retrieved from a building with a mirror and a bookshelf.<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 5047}}</ref>
* A mobile crib appears in [[Asriel]]'s room in [[Toriel's Home]]. It spins when the light is turned off.<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 5256}}</ref>
* In the [[True Pacifist Route#Epilogue|epilogue]], [[Gerson]] appears in the building that contains the Toy Knife and comments on [[The War of Humans and Monsters]].<ref name="return to old home">{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 17684}}</ref> A Froggit also appears near the aforementioned entryway and comments on the previous fallen humans.<ref>{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 17652}}</ref>

=== Snowdin ===
[[File:Snowdin Town location Noelle 10th anniversary stream.png|thumb|alt=A view of [[Snowdin Town]] featuring [[dr:Noelle|Noelle]] and [[Snowdin/NPCs|several other NPCs]].|[[dr:Noelle|Noelle]], as seen in [[Snowdin Town]].]]
* In [[Snowdin]], a new area was added nearby the [[mysterious door]] via a descending tunnel going down. A Lumberjack NPC appears, who muses about staying in that area and mentions that Asgore has visited everywhere. This area can be exited via a lift in the shape of a dog, placing the protagonist just after the third [[Snowdin/Puzzles#The XOXO puzzles|XOXO puzzle]].<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 7589}}</ref>
** In the epilogue, the Lumberjack has decided to put hats on the trees instead of cutting them down.<ref>{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 17334}}</ref>
* A young [[dr:Noelle|Noelle]] can be seen behind the decorated tree at the center of [[Snowdin Town]].<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 8157}}</ref>
* The [[snoring guests]] found when renting a room in the [[Snowed Inn]] play saxophones instead of sleeping. The melody they play is the same as the one in "''[[Determination (soundtrack)|Determination]]''".<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 8086}}</ref>
* The phone call dialogue associated with the [[wrong number song]] was changed, and the song was replaced by ''Wrong Number Remix'', by Camellia.<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 8248}}</ref><ref name="camellia" />
* Several community goals were held as incentives, with four of them, ranging from $25,000 to $230,000, being tied to Sans. All of these segments take place in an empty version of the [[Dog Shrine]] room, located beneath the tall sink in [[Papyrus and Sans's house]].
** '''$25,000:''' Unlocks "Verse Sans". After the protagonist defeats Papyrus, they can enter the empty Dog Shrine room during the hangout with him. Inside, they ask Sans to do a verse battle for charity. Though reluctant at first, Sans agrees and begins rapping about himself. Papyrus soon enters, asking if they are "''SAYING VERSES''", which Sans confirms and clarifies that his verses are only about himself. Papyrus joins in, sparking a playful rap battle between the two. The exchange revolves around Papyrus claiming his computer broke due to a "''VIRUS''". Sans suspects hacking or unusual subscribers, but Papyrus explains that his CPU "''WENT ON STRIKE''" after he posted a status confessing he dislikes anime, which he claims "''INVITES AN INFANTILE WORLDVIEW''". Sans warns that the computer may be under attack by a "''nerdy stranger''". When Papyrus asks what to do, Sans advises lowering his aggression and admitting that it was just a minor mistake. Papyrus realizes the "virus" was simply someone downvoting his post, later revealed to be a girl. He decides to make his post friends-only, leaving satisfied and ending the rap battle.<ref name="verse sans">{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 9048}}</ref>
** '''$80,000:''' Unlocks "Battle Sans". After the protagonist completes all of Mettaton's segments, they can return to the empty Dog Shrine room, tell Sans that another charity goal has been reached and ask him to battle them. Though admitting he is not much of a fighter and expects to lose, Sans agrees for charity's sake. He initiates an [[encounter]], allowing the player to engage in a fight with him briefly before leaving the room, which forces the player to [[flee]].<ref name="battle sans">{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 19627}}</ref>
** '''$200,000:''' Unlocks "Sans Attacks". After the protagonist reloads their [[SAVE]] file after defeating Omega Flowey, they can return to the empty Dog Shrine room once again. Upon hearing that another goal has been met, Sans is asked to initiate a fight himself. Surprised and doubtful that anyone would donate for such a thing, he nevertheless agrees for charity's sake, though only once. He initiates another encounter, this time letting the player experience [[Sans/In battle (10th Anniversary)|a full battle against him]].<ref name="sans attacks">{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 10577}}</ref>
** '''$230,000:''' Unlocks "Ask Sans To Go All Out". During the True Pacifist Route epilogue, the protagonist can return to the empty Dog Shrine room one final time. Before they can speak, Sans guesses what they were going to ask. He admits that he appreciates the "''charity stuff''", but says that fighting is not really his thing. To him, concepts like "right" and "wrong" are not simply numbers to add or cancel out, though he acknowledges the protagonist's good intentions. Instead of fighting, he suggests doing something kind and offers a hug. If the protagonist accepts, they approach Sans, only to fall for his "''ol' full-body''" whoopee cushion trick. Papyrus then enters, asking about the noise. Sans explains it was the same prank he used earlier on the protagonist, which Papyrus deems "''COOL''", though only once. Papyrus leaves, and Sans follows him shortly after.<ref name="sans hug">{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 16640}}</ref>
* Papyrus's "secret style" that he usually changes into during the hangout with him was completely redesigned. The T-shirt now reads "COOK DUDE" instead of "COOL DUDE", and the rest of Papyrus's appearance is more similar to that of a cook.<ref name="cook dude">{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 9548}}</ref>
* While Spamton A. Spamton plays the game, [[dr:Spamton|Spamton]] replaces Sans during most of the conversation at [[Grillby's]], changing a majority of the dialogue and events. Spamton also devours a 258 pixels-large fry. After the hosts came back, this character swap was reverted, albeit Sans's dialogue differed slightly at the end.<ref name="spamton">{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 10005}}</ref>
* After defeating Asriel, [[Glyde]] appears in front of the mysterious door, revealing that he had broken it open after 10 years. This negates the need to complete the [[True Pacifist ending credits]] without touching any names.<ref>{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 16974}}</ref>

=== Dog Hole ===
{{Main|Dog Hole}}
[[File:Dog Hole location.png|thumb|The first and only known room of the Dog Hole.]]
{{Quote
| (10 years worth of dog hair has accumulated...)
(... forming a living labyrinth beyond understanding.)
(... the dungeon stretches on for hours before you...)
(You're filled with determination.)
| [[SAVE Point]] at the beginning of Dog Hole the first time you interact with it
}}
A new room added in Snowdin's mysterious door, which can be entered via a hole in the center of the room where the Annoying Dog originally slept. It is a "''living labyrinth''" of a decade worth of accumulated dog hair, and its sole SAVE Point reveals it has 100 floors.<ref>{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 17038}}</ref>

However, it is not explored past the first room as the hosts decide it would take too long to go through for the purposes of the livestream. [[Abberant]] and [[Mr. Sunshine]] (the latter of whom is a cut enemy from ''Undertale''<nowiki/>'s [[Hard Mode]]) are fought here, as well as two unnamed enemies encountered while leaving that are immediately fled from before any interactions are made. The assets refer to the latter two as "[[Vitamoid]]" and "[[Wintercoat]]".
{{Clear}}

=== Waterfall ===
[[File:Waterfall location fake hallway 10th anniversary stream.png|thumb|The brown door in the fake hallway of [[Waterfall]].]]
* The gray door leading to <code>room_mysteryman</code> in the [[fake hallway]] has been replaced by a brown door, which seems to resemble [[Papyrus and Sans's house#First floor|the door to Sans's room]]. The door is ignored by the hosts,<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 12123}}</ref> and the hallway is absent when they return through the same area in the epilogue.<ref>{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 16538}}</ref>
* The [[Punch Card]] obtained from buying [[Nice Cream]] from Nice Cream guy's stand has been altered. It displays a drawing of a smiling bunny alongside the text: "''it's cool if you leave. probably.''"<ref name="punch card">{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 12140}}</ref>
* The linear path with [[Onionsan]] instead takes place in an underwater village with unique NPCs, and the protagonist traversing upside down in a bubble.<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 12414}}</ref>
* The spiderweb in [[Napstablook's house]] was replaced with a fourth CD, which is labeled "Mettaton Voice Drama CD". The CD's contents are Mettaton repeatedly saying "''OH YES!''" at varying pitches and speeds.<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 13714}}</ref>
* During the date with Undyne, before Papyrus leaves by breaking the window, Undyne requests that he use the door instead. Papyrus complies in his own way by opening the window as if it were a door, exiting through it. After Undyne tells the protagonist to leave her house, Papyrus reappears, instead spilling broken glass shards out of nowhere and crashing through the door upon re-entering [[Undyne's house]], causing the protagonist to step aside.<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 15521}}</ref>
* During the date with Alphys, Sans appears in a "Dr. Jogboy" outfit before Papyrus appears in his "Jogboy" outfit like in the regular game.<ref>{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 11547}}</ref>
* The poster in Mettaton's house was extended to reach the left side of the house.<ref>{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 11771}}</ref>

=== Hotland ===
[[File:Fire-E overworld.png|thumb|Fire-E, Hotland High's extremely unpopular mascot.]]
* Hotland has several new background buildings, many of which are floating and hanging by chains. Hotland High is a new location, featuring new NPCs and cameos from ''Deltarune'' characters such as [[dr:Milk Looker|Milk Looker]].<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 17914}}</ref> A sequence involving the school took the place of the section immediately before the bomb defusal.
* During the bomb defusal minigame, the Script Bomb was changed out for a Mad Bomb, which used the sprite of [[Mad Mew Mew]]. Instead of having the option to defuse the bomb, the protagonist had to fuse Mad Mew Mew's head with her body.<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 18257}}</ref>
* On the far-right platform of the [[Hotland/Puzzles#Third Floor|last steam vent puzzle]] is a new NPC holding a camera, as a way to poke fun at the room's appearance in every trailer.<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 18737}}</ref>
* In the MTT Resort, the protagonist can sleep in a wider bed than usual for 200G, and a different beat, ''Ultranap'', plays while they move around the bed.<ref>{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 4523}}</ref>

=== New Home ===
[[File:New Home location two paths 10th anniversary stream.png|thumb|The path leading to [[New Home]]'s "Nose-Nuzzling" stage.]]
* Before the Last Corridor, there is a new path next to the elevator. After the "Return to New Home" incentive was reached, the path is revealed to lead to a populated grayscale version of Home with a "''Nose-Nuzzling''" stage at the center. In the following order, the protagonist can get nuzzled by Toriel, Papyrus, Undyne, and Monster Kid.<ref name="return to new home">{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 15577}}</ref>

=== True Lab ===
* When the shower curtains are pushed out of the way, a strange creature made out of photorealistic human body parts shows up in the shower. It then says "''You should knock.''" as an audible voice clip and disappears into the curtain. Its filename in the graphics zip file is <code>manners</code>.<ref>{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 12292}}</ref>
* The hallway preceding the [[DT Extraction Machine]] features laughing mouths on the side of the wall.<ref>{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 12779}}</ref>

=== Barrier ===
* Omega Flowey uses some of his unused faces upon being confronted by the six human SOULs, and his dialogue is slightly altered.
** ''The souls...?''
** ''What are they...''
** ''HEY, YOU GUYS AREN'T GONNA...''
* Asriel has new dialogue as he is being SAVEd, which replaces [[Asriel/In battle#Battle|his 7th turn's original battle dialogue]].<ref>{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 14834}}</ref>
** ''I'm not ready for this to end.''
** ''It can't have been a year already.''
** ''It can't have been 5 years already.''
** ''It can't have been 10 years already.''
** ''It can't have been...''
** ''Everything, everyone I loved can't keep getting further away.''
** ''We can't go any further than this. Please.''
** ''I don't want to keep growing up...''
** ''Not without you.''
* After the game's regular credits, a new ending graphic with the main cast appears, followed by the additional credits for the modified version of ''Undertale'' used in the stream.<ref name="credits" />

== Live action ==
The ''UNDERTALE'' 10th Anniversary Stream has two live-action segments during Day 1:

Halfway through the stream, the Fangamer Dads and the Annoying Dog leave the room. The camera pans to Spamton A. Spamton crawling through a cavern and entering the room via a slimy pink-and yellow Spamton-shaped entrance. He realizes he is unable to talk, stands up, and spins to become large. After sitting on the couch with a [[dr:Cartoon splat noise|cartoon splat noise]], ''[[dr:HEY EVERY !|HEY EVERY !]]'' plays as he pulls a large pink-and-yellow disk from his coat. He inserts it into the TV and returns to the couch to play and move the protagonist into the Grillby's.<ref name="spamton a. spamton">{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 9868}}</ref>

During Spamton's dialogue, Spamton A. Spamton changes his posture multiple times as the dialogue advances. This includes him mashing, rubbing the buttons, laying upside down, being behind the couch, appearing bored, mashing with a spoon, hopping, answering a phone, pecking with his nose, yelling in despair, pointing, or twitching. While trying to revert back, Spamton A. Spamton leaps in the air and yells before turning into a cup with S.A.S. on the back and rolling into the door. During the zoom in to the cup's face, ''[[dr:Dialtone|Dialtone]]'' plays. The cup is later pushed away when the door opens.<ref name="spamton" />

At the end of Day 1's stream, 3D Toriel physically appears in the form of a piñata. While the other Fangamer Dads insist that Reid should not let her into the room, she enters anyways. Reid notices 3D Toriel being a piñata, takes out a bat, and as he swings, the screen glitches and depicts a hybrid of various 3D Toriel moments from ''Undertale'' trailers. Afterwards, everyone is shown unconscious and surrounded by pink and yellow candy. As the camera pans and zooms in to 3D Toriel, her eyes focus on the camera before the screen turns black.<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 19706}}</ref>

== New NPCs ==
{|class="wikitable sortable"
! Name
! class="unsortable" | Image
! Location
! class="unsortable" | Notes
|- id="Lumberjack"
| Lumberjack
| style="text-align:center;" | [[File:Lumberjack overworld.png]]
| [[Snowdin]]
| Muses about staying in the location and only chopping trees due to resembling them. The Lumberjack also mentions that Asgore has been everywhere in the [[underground]]. In the epilogue, the Lumberjack decides to offer hats to the trees, rather than destroying them.
|- id="Noelle"
| [[dr:Noelle|Noelle]]
| style="text-align:center;" | [[File:Noelle overworld tree.png]]
| [[Snowdin Town]]
| Was not interacted with at all during the stream, and is not included in the official Graphics compilation.
See also: [[Dog Shrine]] and [[Asgore Winter Dialogue|Asgore's Winter Dialogue]] from the [[UNDERTALE Alarm Clock|''UNDERTALE'' Alarm Clock]] for other allusions to Noelle's ''Undertale'' counterpart.
|- id="Underwater NPC 2"
| Underwater NPC 2
| style="text-align:center;" | [[File:Underwater NPC 2 overworld.png]]
| [[Waterfall]]
| Makes bubble noises, though the protagonist does not understand the accent.
|- id="Underwater NPC 4"
| Underwater NPC 4
| style="text-align:center;" | [[File:Underwater NPC 4 overworld.gif]]
| [[Waterfall]]
| Was not interacted with during the stream.
|- id="Underwater NPC 1"
| Underwater NPC 1
| style="text-align:center;" | [[File:Underwater NPC 1 overworld.png]]
| [[Waterfall]]
| Makes bubble noises, though the protagonist does not understand the accent.
|- id="Underwater NPC 3"
| Underwater NPC 3
| style="text-align:center;" | [[File:Underwater NPC 3 overworld.png]]
| [[Waterfall]]
| Has an older bubble noise dialect than Underwater NPCs 2 and 1.
|- id="Underwater NPC 5"
| Underwater NPC 5
| style="text-align:center;" | [[File:Underwater NPC 5 overworld.gif]]
| [[Waterfall]]
| Admits to wearing a "fire-proof diving suit". Appears to be a fire-based monster.
|- id="Hall Monitor"
| Hall Monitor
| style="text-align:center;" | [[File:Hall Monitor overworld.gif]]
| [[Hotland]]
| Shares a resemblance with [[Fuku Fire]].
|- id="Ficus Student"
| Ficus Student
| style="text-align:center;" | [[File:Ficus Student overworld.png]]
| [[Hotland]]
| Shares their appearance with the [[ficus licker]].
|- id="Milk Student"
| Milk Student
| style="text-align:center;" | [[File:Milk Student overworld.png]]
| [[Hotland]]
| Shares their appearance with [[dr:Milk Looker|Milk Looker]] from ''Deltarune''.
|- id="Bird Teacher"
| Bird Teacher
| style="text-align:center;" | [[File:Bird Teacher overworld.png]]
| [[Hotland]]
| Shares a resemblance with [[dr:Berdly|Berdly]] from ''Deltarune''.
|- id="Hotland High Student 2"
| Hotland High Student 2
| style="text-align:center;" | [[File:Hotland High Student 2 overworld.png]]
| [[Hotland]]
| Was not interacted with during the stream.
|- id="Hotland High Student 1"
| Hotland High Student 1
| style="text-align:center;" | [[File:Hotland High Student 1 overworld.png]]
| [[Hotland]]
| Was not interacted with during the stream. Their face is never visible.
|- id="Hotland High Student 3"
| Hotland High Student 3
| style="text-align:center;" | [[File:Hotland High Student 3 overworld.png]]
| [[Hotland]]
| Was not interacted with during the stream.
|- id="Temmie Student"
| Temmie Student
| style="text-align:center;" | [[File:Temmie overworld school.png]]
| [[Hotland]]
| [[Temmie]] in a high school uniform. Was not interacted with during the stream.
|- id="Squident"
| Squident
| style="text-align:center;" | [[File:Squident overworld.png]]
| Unused
| Present in the graphics files but went unused. The name and outfit suggests the NPC would have been seen in Hotland High. They bear a resemblance to [[Skateboard Girl]].
|- id="Vent Fan"
| Vent Fan
| style="text-align:center;" | [[File:Vent Fan overworld.gif]]
| [[Hotland]]
| Dialogue is reminiscent of [[dr:Shuttah|Shuttah]] from ''Deltarune''. Their behavior is a joke about the frequent usage of shots of Hotland's vent area in ''Undertale''<nowiki/>'s trailers.
|- id="Panet"
| Panet
| style="text-align:center;" | [[File:Panet overworld.png]]
| [[New Home]]
| Appears in New Home, painting a building orange.
|- id="Griffon Claw"
| Griffon Claw
| style="text-align:center;" | [[File:Griffon Claw overworld.png]]
| [[New Home]]
| -
|- id="Arbiter Crab"
| Arbiter Crab
| style="text-align:center;" | [[File:Arbiter Crab overworld.png]]
| [[New Home]]
| Is the arbiter of the "Nose-Nuzzling" tournament. Despite his appearance, he is only 18 years old.
|- id="Manners"
| Manners
| style="text-align:center;" | [[File:Manners overworld.png]]
| [[True Lab]]
| A creature that is revealed behind the True Lab's shower curtain before leaving. Appears to be made up of parts of one or more photos of human faces.
|}

== Incentives ==
=== Day 1 ===
==== Polls ====
* Name choice between TOGORE and CHARA.
* Burger or Fries?<ref name="spamton "/>
* Ketchup or Catsup?

==== Targets ====
* Get Nice Cream card ($2,500)<ref name="punch card" />
* Visit Napstablook ($2,500)<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 13425}}</ref>
* Hot Dog Tower ($200/dog out of $6,000)
* Fight Muffet ($10,000)

==== Community goals ====
* Verse Sans ($25,000)<ref name="verse sans "/>
* Battle Sans ($80,000)<ref name="battle sans "/>

=== Day 2 ===
==== Polls ====
* Name choice between TOGORE and CHARA.
* Essay on [[dr:Media_in_Deltarune#Mew_Mew_franchise|Mew Mew Kissy Cutie]] (Reviewbless or Reviewbomb?)
* Anime Is Real or Anime Is Not Real?

==== Targets ====
* Sleep at MTT Hotel ($5,000)
* Buy the Mystery Key ($5,000)
* Sleep in Creepy Bed ($2,000)
* Return to New Home ($10,000)<ref name="return to new home"/>
* Return to Old Home ($10,000)

==== Community goals ====
* Sans Attacks ($200,000)<ref name="sans attacks"/>
* Ask Sans To Go All Out ($230,000)<ref name="sans hug"/>
* Toby Not Nap ($270,000)
* Surpass [[dr:Spamton Sweepstakes|Spamton Sweepstakes]] ft. Spamton A. Spamton ($322,805.68)

== Auctions ==
Two one-of-a-kind items were individually auctioned at tiltify.com, and treated separately from the charity event:
{| class="wikitable"
! Item
! Description
! Credits
! class="nowrap" | Highest Bid (Day 1)
! class="nowrap" | Highest Bid (Day 2)
|-
| Giant Toriel Plush
| Giant version of the [https://www.fangamer.com/collections/undertale/products/undertale-toriel-plush regular Toriel plush.] Featured on stream set with the Fangamer staff, mostly with Reid playing with it, "increasing her value".<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 8897}}</ref> She was also subjected to Spamton A. Spamton's abrupt appearance.<ref name="spamton a. spamton" />
| Eyes5<ref name="eyes5" />
| $3,600
| $11,000
|-
| 10th Anniversary TV Diorama
| Physical diorama of the 10th Anniversary logo, with the Annoying Dog sitting in front of a CRT featuring the [[List of human SOULs|seven human SOUL]]s on screen arranged similarly to the Omega Flowey fight, a [[wikipedia:Nintendo 64|Nintendo 64]], a Hot Dog on a plate, and author's signature on the back. Made from wood, wire, polymer clay, felted wool, chrome paint, fluid acrylics, and light-absorbing matte black paint. Featured occasionally in the Day 2 stream.<ref>{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 3629}}</ref>
| Camille Young<ref name="camille young" />
| $5,000
| $13,969.67
|}

== Differences from 6th Anniversary Stream ==
=== General ===
* An animated 10th Anniversary logo of the Annoying Dog crawling out of the CRT.<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 3618}}</ref>
* An animated introduction segment of various ''Undertale'' characters at the Last Corridor.<ref>{{Cite youtube|id = JJWXlVClFt0|title = UNDERTALE 10th Anniversary Stream - Day 1|timestamp = 3628}}</ref>
* ''Undertale'' developer names, avatars, website, and contribution appears at the bottom of the screen.
* New locations unique to the stream are featured.
* Contains cameos or allusions to ''Deltarune''.
* The Ruins set the Fangamer staff and Annoying Dog appears in has its decorations and merchandise replaced when they reach another location in the underground.

=== Annoying Dog ===
* The Annoying Dog plush's mouth moves when talking, and captions appear for Toby's text-to-speech commentary.
* The Annoying Dog's sprite appears with a dark background to occasionally cover the set camera. The dog's mouth moves along with the text-to-speech commentary, and occasionally does flips.
* The Annoying Dog sprite can turn green, often to indicate when Toby mentally blanks.
* The Annoying Dog in the 10th Anniversary logo is occasionally animated, such as dancing and shaking the maracas. The logo's background resemble the [[border]]s for [[Version differences|console versions]] of ''Undertale''.
** Once Flowey absorbs the six human SOULs, the logo disappears entirely. The CRT reappears at the start of the Omega Flowey battle, flashing various messages until Omega Flowey breaks through, flashing question marks in various fonts and attempting to break free from the border.<ref>{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 8176}}</ref> He is eventually stopped by 3D Toriel, fleeing for the remainder of the battle. The 10th Anniversary logo reappears as normal after the break following the battle and ending.
** During the [[Lost Souls]] part of the Asriel battle and the first half of the True Pacifist ending credits, several talksprites submitted to the website appear behind the logo, scrolling upwards in a grid arrangement.<ref>{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 14447}}</ref><ref>{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 18936}}</ref>
* The Annoying Dog gets equipped with some items from the area, such as the [[Faded Ribbon]].

== Soundtrack ==
{{Main|UNDERTALE 10th Anniversary Stream Soundtrack}}
The '''10th Anniversary Stream Soundtrack''' consists of tracks that play exclusively on the ''Undertale'' build used for the stream. After the stream ended, the tracks were publicly released on the ''Undertale'' website.<ref name="music battles" /> On January 21, 2026, the tracks were released to [https://tobyfox.bandcamp.com/album/undertale-10th-anniversary-stream-soundtrack Toby Fox's Bandcamp.]

== Intermission tracks ==

{{Stub|reason= Second half of stream 2 not noted here}}
Tracks that played during pre-stream and intermissions, where the protagonist walks and listens to Echo Flowers that display submitted Memories. This includes fanmade music tracks from the [https://underveil.unisphere.tv/ UNDERVEIL project] <ref name="ut underveil "/> and arrangements from Carlos "insaneintherain" Eiene,<ref name="snowed inn jazz what's up" /> including tracks from his [https://insaneintherainmusic.bandcamp.com/album/live-at-grillbys Live at Grillby's] album.

{| class="wikitable sortable"
|+
! Title
! Album
! Author
! Day
! class="unsortable" | Time
|-
| [https://youtu.be/jLO4VgFpYQg ''Re-Undulate'']
| UNDERVEIL
| Kankitsu
| 1
| 00:00:00 - 00:06:18
|-
| [https://youtu.be/HwWjT5q674w ''Battle of Ordeal'']
| UNDERVEIL
| daph
| 1
| 00:06:24 - 00:11:35
|-
| [https://youtu.be/twJ7etRyOi4 ''Spear of Justice(MRM REMIX)'']
| UNDERVEIL
| モリモリあつし
| 1
| 00:11:42 - 00:15:35
|-
| [https://youtu.be/_1ei5O_5_pA ''Undersouls'']
| UNDERVEIL
| shimaL
| 1
| 00:15:44 - 00:22:06
|-
| [https://youtu.be/1JbKOeeGRAM ''It's a Beautiful Day Outside (MEGALOVANIA)'']
| Live at Grillby's
| Carlos "insaneintherain" Eiene
| 1
| 00:22:13 - 00:28:52
|-
| [https://youtu.be/DUn85YgDgKE ''Welcome Home (Home)'']
| Live at Grillby's
| Carlos "insaneintherain" Eiene
| 1
| 00:28:53 - 00:35:40
|-
| [https://insaneintherainmusic.bandcamp.com/track/turnabout-skeleton-brothers-dating-start ''Turnabout Skeleton Brothers (Dating Start!)'']
| Live at Grillby's
| Carlos "insaneintherain" Eiene
| 1
| 00:35:45 - 00:40:30
|-
| [https://youtu.be/bxQfcQ1pc94 ''Hopes and Dreams "A Newer New Home"'']
| UNDERVEIL
| orangentle
| 1
| 00:40:33 - 00:44:57
|-
| [https://youtu.be/YaL-oOg9mIA ''Undiscardable'']
| UNDERVEIL
| Frums
| 1
| 00:45:03 - 00:49:51
|-
| [https://youtu.be/18JcokLs33I ''Dogdance'']
| UNDERVEIL
| s-don
| 1
| 00:49:59 - 00:55:43
|-
| [https://youtu.be/18JcokLs33I ''A Date with Demise (It's Raining Somewhere Else)'']
| Live at Grillby's
| Carlos "insaneintherain" Eiene
| 1
| 00:55:48 - 01:00:16
|-
| [https://youtu.be/A59sGFPb6dU ''Fallen Down (Reprise) Butterscotch cinnamon mix'']
| UNDERVEIL
| こふ
| 1
| 02:52:33 - 02:55:42
|-
| [https://youtu.be/XJicdInJTXk ''ASGORE (Puru Remix)'']
| UNDERVEIL
| Puru
| 1
| 02:55:48 - 03:00:30
|-
| [https://youtu.be/XJicdInJTXk ''Fascinate ft. Muffet'']
| UNDERVEIL
| ryhki
| 1
| 03:00:39 - 03:04:07
|-
| [https://youtu.be/earH1825vYY ''Howdy! and... Good-Die!'']
| UNDERVEIL
| ゆうゆ
| 1
| 03:04:28 - 03:07:31
|-
| [https://youtu.be/w_C7UMiKpnM ''Only'']
| UNDERVEIL
| izna
| 1
| 05:30:40 - 05:36:51
|-
| [https://youtu.be/DXuOAWnuMVY ''The Incinerator (Another Medium)'']
| Live at Grillby's
| Carlos "insaneintherain" Eiene
| 1
| 05:36:56 - 05:43:07
|-
| [https://youtu.be/XhiAEj_180A ''DREAMEND'']
| UNDERVEIL
| Saiph
| 1
| 05:43:15 - 05:47:52
|-
| [https://insaneintherainmusic.bandcamp.com/track/ice-to-meet-you-snowdin-town ''Ice to Meet You! (Snowdin Town)'']
| Live at Grillby's
| Carlos "insaneintherain" Eiene
| 1
| 05:47:56 - 05:53:38
|-
| [https://youtu.be/QmaNSESs_bw ''Bergentrückung / ASGORE'']
| insaneintherainmusic Year 4
| Carlos "insaneintherain" Eiene
| 1
| 05:53:42 - 05:59:59
|-
| [https://youtu.be/tWZ-6Xhdv98 ''Unbelievable surrounded by Blue'']
| UNDERVEIL
| Tanchiky
| 2
| 00:00:00 - 00:01:15, 02:32:45 - 02:36:14
|-
| [https://youtu.be/XhiAEj_180A ''DREAMEND'']
| UNDERVEIL
| Saiph
| 2
| 00:01:15 - 00:06:00, 02:36:14 - 02:41:00
|-
| [https://youtu.be/DXuOAWnuMVY ''The Incinerator (Another Medium)'']
| Live at Grillby's
| Carlos "insaneintherain" Eiene
| 2
| 00:06:00 - 00:12:15, 02:41:00 - 02:47:13
|-
| [https://youtu.be/THLJG2rh7vg ''A Mother's Love (Heartache)'']
| Live at Grillby's
| Carlos "insaneintherain" Eiene
| 2
| 00:12:15 - 00:16:56, 02:47:13 - 02:48:02
|-
| [https://youtu.be/_-2IfPOl5MU ''The Star of the Underground'']
| UNDERVEIL
| Kiryu
| 2
| 00:16:56 - 00:21:57
|-
| [https://youtu.be/FR_A0wUlbwU ''Ruins'']
| insaneintherainmusic Year 5
| Carlos "insaneintherain" Eiene
| 2
| 00:21:57 - 00:28:14
|-
| [https://youtu.be/DUn85YgDgKE ''Welcome Home (Home)'']
| Live at Grillby's
| Carlos "insaneintherain" Eiene
| 2
| 00:28:14 - 00:35:04
|-
| [https://youtu.be/act3vl4jIyw ''NEVERAGAIN'']
| UNDERVEIL
| Silentroom
| 2
| 00:35:04 - 00:40:08
|-
| [https://youtu.be/w_C7UMiKpnM ''Only'']
| UNDERVEIL
| izna
| 2
| 00:40:08 - 00:46:24
|-
| [https://youtu.be/V076SVoepVg ''Undertale (feat. SwigglesRP)'']
| insaneintherainmusic Year 5
| Carlos "insaneintherain" Eiene, Ro "SwigglesRP" Panuganti
| 2
| 00:46:24 - 00:51:22
|-
| [https://youtu.be/A59sGFPb6dU ''Fallen Down (Reprise) Butterscotch cinnamon mix'']
| UNDERVEIL
| こふ
| 2
| 00:51:22 - 00:54:44
|-
| [https://youtu.be/YaL-oOg9mIA ''Undiscardable'']
| UNDERVEIL
| Frums
| 2
| 00:54:44 - 00:57:50
|}

== Gallery ==
<gallery>
Annoying Dog overworld poisoned.png | The Annoying Dog "poisoned".<ref name="poisoned" />
Home map.png | Map of new area in the Ruins, Home.
Snowdin map Forest.png | Map of new area in Snowdin.
Papyrus battle "Cook Dude".png | Papyrus in his "COOK DUDE" attire.<ref name="cook dude" />
Punch Card item 10th anniversary stream.png | Punch Card.<ref name="punch card" />
Underwater Town location.png | Underwater Town, a new area in Waterfall.
Hotland High map.png | Hotland High, a new area in Hotland.
Mettaton overworld sailor fuku.gif | Mettaton dressed up as an "exchange student" at Hotland High.
Omega Flowey battle smile.png | First of the new faces of Omega Flowey.
Omega Flowey battle sweat.png | Second new face of Omega Flowey.
Omega Flowey battle look right.png | Third new face of Omega Flowey.
New Home location nose-nuzzling competition 10th anniversary stream.png | New area in New Home.
Glyde overworld.png | Glyde's overworld sprite, as seen in Snowdin.
Vitamoid battle idle.gif | Vitamoid.
Wintercoat battle idle.gif | Wintercoat.
Gerson overworld.png | Gerson's overworld sprite, as seen in Home.
Ending screenshot 10th anniversary stream.png | The ending scene before the stream credits.
End card screenshot 10th anniversary stream.png | The message at the end of the stream.
</gallery>

== Trivia ==
* In the edited wrong number song, the caller mentions that their favorite "''M**vel Superhero''" is "''D**key Kong!''", referencing [[tcrf:Undertale#Donkey Kong is my Favorite Marvel Superhero|a variable]] known as <code>donkeykongismyfavoritemarvelsuperhero</code>.
* When inspecting Papyrus in his "COOK DUDE" outfit, there was dialogue written related to checking his "fried chicken legs". This dialogue was jokingly referred to as "lost media" by Toby as it was exclusive to the stream's version of the game yet was not read by the players.
* The sound played after entering and exiting the Ruins (and at the various endings) is a noise made by Toby's mouth.
[[File:Green Radioactive Fox artwork concept cool pose.png|thumb|The fox that Toby repeatedly showed off, drawn by Cap.]]
* The CORE was the only area that did not have new content, thus Cap's spritework of "foxradiation" was repeatedly shown during that section of the stream,<ref>{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 5193}}</ref> as well unused concepts as text files. Cap comments that this fox was drawn on "a funny whim" back in 2013.<ref>{{Cite bluesky|author = caplog.bsky.social|id = 3lzgv3te5x22q|text = About the fox... I drew those sprites on a funny whim back in 2013. Toby hadn't asked for them and I didn't think he ever considered using them. I didn't find out until this year that lava fox stew had been on the menu lol|timestamp = 2025-09-22}}</ref>
* During the date with Alphys, Toby Fox remarks that he just noticed Sans holding a plate of corn offscreen.<ref>{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 11150}}</ref> This is a reference to [https://knowyourmeme.com/memes/cornplate-corn-plate an infamous Twitter post] made by @hourlydolores with a similar statement regarding the 2021 Disney film [[wikipedia:Encanto|''Encanto'']], widely known for pointing out an exceedingly obvious and insignificant detail.
* In the True Lab, Toby mentions a famous story about a dog repeatedly searching for a pie in a bush.<ref>{{Cite youtube|id = FS903HbnfWg|title = UNDERTALE 10th Anniversary Stream - Day 2|timestamp = 12311}}</ref> This is a reference to a viral tweet about someone's pet dog.<ref>{{Cite twitter|author = ChrisBramwell|id = 950819881120825344|text = A month ago Dusty found half a pie in this bush, so every day until the end of time we must closely inspect the Magic Pie Bush.}}</ref>

== See also ==
* [[Anniversary|''Undertale''<nowiki />'s Anniversary]] section
* [[UNDERTALE 10th Anniversary events|''UNDERTALE'' 10th Anniversary events]]
* [[dr:Anniversary|''Deltarune''<nowiki />'s Anniversary]] section on the [[dr:|Deltarune Wiki]]
* [[dr:Spamton Sweepstakes|Spamton Sweepstakes]] article on the [[dr:|Deltarune Wiki]]

== External links ==
* [https://memories.undertale.com/ UNDERTALE - Memories]
* [https://web.archive.org/web/20250726031503/https://memories.undertale.com/ UNDERTALE - Memories], archive.org version from July 26, 2025. Information sent is not saved on the official ''Undertale'' website. It does not use 8bitOperatorPlus-Bold font on download, and avatar art cannot be properly downloaded on mobile.
* [https://ut10-battle.undertale.com/ Battles against Sans, Mr. Sunshine and Abberant]

== 脚注 ==
<references />

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[[Category:10th Anniversary Stream]]
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