Undertale Wiki
For the track named "Undertale", see Undertale (Soundtrack).

"The friendly RPG where nobody has to die!"

Undertale's Release Trailer

Undertale (stylized as UNDERTALE and formerly UnderTale[1]) is a role-playing game developed independently by Toby Fox with additional art by Temmie Chang in the Game Maker: Studio engine.

It was released for Microsoft Windows and Mac OS X on September 15, 2015;[2] for Linux on July 17, 2016;[3] for PlayStation 4 and PlayStation Vita on August 15, 2017;[4] for Nintendo Switch on September 18, 2018;[5] and for Xbox One and Xbox Series X|S on March 16, 2021.[6]

Toby Fox has stated that official Undertale content releases will be noted on official accounts,[7] or through the mailing list on the official Undertale website.[8]


Undertale is a role-playing game that utilizes many genre mechanics, mechanics, albeit differently.

Mad Dummy screenshot battle

The player, represented by the red heart icon, evading enemy attacks.

The battle system in Undertale is turn-based. During the enemy's turn, they attack with bullet hell patterns. The Player must move the protagonist's SOUL, represented by a red heart, to avoid attacks. As the game progresses, new elements are introduced in the form of Attack Types and SOUL Modes. Attacks can be in different colors, some of which can heal the SOUL or be an obstacle. SOUL modes alters the SOUL's color and how it functions in a battle, and is often used during a Boss battle.

During the protagonist's turn, they can use one of the four options per turn: FIGHT, ACT, ITEM, and MERCY. FIGHT damages the opponent with a quick-time event. Selecting an ACT can change the opponent's mood, or reveal information on the enemy. Using an item can benefit the protagonist. If certain conditions are met, MERCY can be selected to spare the enemy, which ends the combat. At the end of the battle, GOLD is earned. Killing an enemy rewards EXP and LV, but neither are given if an enemy is successfully spared. Undertale emphasizes on the morality of killing and sparing the Monsters encountered, as the player's actions determine the ending. Unlike traditional RPGs, it is possible to complete Undertale without killing monsters.

The overworld mostly consists of puzzles that the player must solve to progress. Battles can also be seen as puzzles, as it can require the right set of ACTs to resolve the fight peacefully. However, if the player decides to kill every monster they can find, many puzzles are disabled. In this situation, the player is required to grind encounters to progress the game. Unlike traditional RPGs, grinding, backtracking, and the few sidequests are all optional.

Undertale features witty and humorous dialogue, with occasional fourth wall breaks. The dialogue and locations can be drastically altered based on the player's actions. This ranges from minor options, killing and sparing monsters, and the SAVE feature. For the latter, almost every major character possesses meta-knowledge. If the player quits or resets the game, these characters comment on the player's past action, or have a sense of familiarity from past playthroughs.

Main Story

Long ago, two races ruled over the Earth: Humans and Monsters. One day, a war broke out between the two races. After a long battle, the humans were victorious. Seven of their greatest magicians confined the monsters to the Underground with a magic barrier. However, this barrier is not perfect.

Intro screenshot Chara

The fallen human approaching Mount Ebott.

Many years after the war, in 201X, a human child climbs Mount Ebott for their own mysterious reason. It is said that those who climb the mountain never return. The child discovers an enormous hole in the mountain and falls in. After that, the story begins.

The protagonist starts off their adventure in the Ruins and soon meets Flowey, a sadistic flower who attempts to kill the protagonist for his own amusement. He is thwarted by a motherly monster named Toriel, who teaches the child how to solve puzzles and resolve conflicts in the Underground. After a boss fight with her, she allows the child to exit the Ruins.

The way the story progresses in the main section of the game is determined by the protagonist's actions towards the supporting characters and other monsters. The storyline, as well as much of the dialogue, can vary greatly depending on the player's decisions. The three main paths are the Neutral Route, True Pacifist Route and Genocide Route.


TestMonster screenshot

The earliest known screenshots of Undertale were posted in a joke thread in the PK Hack section of Starmen.Net, where Toby "Radiation" Fox jokingly[9] claimed that the game would be an EarthBound ROM hack called UnderBound 2, this post also contained the earliest known publicly available version of Enemy Approaching, making it one of the first online posts to contain a song from the OST, after MEGALOVANIA and Fallen Down.[10][11]

The first known demo of Undertale was sent to the video game merchandising website, Fangamer, to play back on May 2, 2013.[12] The game was met with positive reviews, so a public demo was later released on May 23, 2013.[13]

Undertale was later funded through a kickstarter campaign with a goal of $5,000. It ended up receiving $51,124 from 2,398 people. Due to the short length of the demo, Fox expected the game to be completed as early as August 2014.


To promote the Nintendo Switch version's release on September 18, 2018, a special collector's edition was sold exclusively on Fangamer (the Nintendo Switch edition could also be bought at select Best Buy stores). The collector's edition includes the game's soundtrack and a music box locket, among other things.

Version History

Main article: Version Differences

There have been five patches for Undertale so far; the current version is v1.08 on all systems except for Nintendo Switch, which is currently at v1.11.


Undertale received "universal acclaim" reviews on Metacritic and is tagged as a "Must-Play" game receiving a metascore of 92/100 on both PC[14] and PS4,[15] while its Nintendo Switch release gets a metascore of 93/100.[16]


  • Toby Fox has cited many games that inspired him when he was developing Undertale:
  • The developers used Microsoft Paint and GraphicsGale to draw the graphics and FL Studio 10 to make Undertale's music.[21]
  • On the official Undertale website:
    • Inspecting the main website's page source reveals a hidden message. It is, "What are you doing? Looking for secrets? Don't put your nose where it doesn't belong. Or you might learn something you DON'T like... Hee hee hee."
    • On the "ABOUT" section, two preview images has the fallen human's written name as Taco.
    • The page title of the website's "DEMO" section is "UNDERTALE Delicious Free Sample."
  • Undertale's official anniversary date is September 15, which is the original PC version's release date. It is confirmed in the Undertale/Deltarune Newsletter that the anniversary is often celebrated with a special event:[22]
    • 2016, 1st anniversary: features a separate, official Undertale blog, named Undertale Q&A, where various tumblr users asked Undertale characters questions. It was originally announced a day prior on the official Undertale tumblr.[23]
    • 2017, 2nd anniversary: different posts were made by the official Undertale tumblr and twitter:
      • The Undertale twitter announces purchasable Undertale content. It is Line Stickers, and the exclusive Playstation 4 dynamic theme, "Ruins."[24] The latter depicts Home, with Waterfall's light blue stars overhead.
      • On the Undertale tumblr, Toby Fox announces that the Undertale Alarm Clock App is in production, and shares dialogue and interface previews.[25]
    • 2018, 3rd anniversary. Toby Fox states this in a tweet and thanks everyone. He also reminds that the Nintendo Switch version of Undertale will be available in three days.[26]
    • 2019, 4th anniversary: the Undertale twitter acknowledges the fourth anniversary, and the inclusion of the Sans outfit and MEGALOVANIA remix in Super Smash Bros. Ultimate.[27]
      • As of 2019 and above, the Undertale anniversary is also celebrated with Deltarune content.
    • 2020, 5th anniversary. Three were revealed, including new Line Stickers:[28]
    • 2021, 6th anniversary: New Line Stickers were announced.[32]


  1. Every capitalization is canon. Undertale. UnderTale. UNDERTALE - Toby Fox (@tobyfox) on Twitter, January 15, 2015. [deleted]
  2. UNDERTALE Release Trailer - YouTube
  3. UNDERTALE is now available for Linux on Steam! Also, the game's still on sale for the next 24 hours, so... - @UnderTale on Twitter, July 17, 2016.
  4. UNDERTALE PlayStation 4, PS Vita E3 2017 Announce Trailer - YouTube
  5. Undertale - Release Trailer - Nintendo Switch - YouTube
  6. UNDERTALE Xbox One Announce Trailer - YouTube
  7. All DELTARUNE / UNDERTALE content that releases will be noted on official accounts and be credited to "Toby Fox". If you see a strange post or tweet that looks like it's from me, check the spelling of the username to make sure. - fwugradiation on Tumblr, October 13, 2022.
  8. I'm going to be starting an UNDERTALE/DELTARUNE mailing list so you can get updates no matter where on the internet you are! I'll tweet about it here, or you can check http://undertale.com in around 24 hours. - Toby Fox (@tobyfox) on Twitter, November 18, 2022.
  9. Some people actually think a joke/troll post I made in a friend's forum topic about Undertale originating as an EB ROM hack is true... - Toby Fox (@tobyfox) on Twitter, March 12, 2016.
  10. UnderBound
  11. EnemyApproachingnes2
  12. Office Cam tomorrow at 8:30pm EST! We'll be playing @FwugRadiation's game: Undertale - @Fangamer on Twitter, May 02, 2013.
  13. undertale.com The demo is out. - @UnderTale on Twitter, May 23, 2013.
  14. Universal acclaim based on 43 Critic Reviews - Undertale for PC Reviews (September 20, 2015.) Metacritic.
  15. Universal acclaim based on 18 Critic Reviews - Undertale for PlayStation 4 Reviews (August 15, 2017.) Metacritic.
  16. Universal acclaim based on 8 Critic Reviews - Undertale for Switch Reviews (September 18, 2018.) Metacritic.
  17. So, the point of the game is to repair the damage the "Hero" caused and increase your LV, (which stands for LOVE) by helping people instead of hurting them.

    ... Anyway, you can see how this inspired UNDERTALE. Even though I didn't play it (it's in Japanese.)
    - Toby Fox (@tobyfox) on Twitter, November 17, 2017.
  18. MOTHER 3 was a really influential game to me. If I hadn't played it, I never would have created the Toriel battle, or, well, any of the other boss battles in the game. It also probably influenced how I try to re-use motifs in my songs, now that I think about it... - Toby Fox (@tobyfox) on Twitter, April 21, 2021.
  19. I've been a fan of Touhou since I was 10 years old... It's quite a big inspiration to me both musically and gameplay-wise, so if you enjoyed the bullet patterns in UNDERTALE, please check it out sometime. ヨホ - Toby Fox (@tobyfox) on Twitter, May 23, 2018.
  20. The ACT and MERCY commands were inspired by Shin Megami Tensei. I played just a bit of that game and loved talking to the monsters in it. Since I liked it so much, I decided I wanted to make a game where that was actually the main focus. - Undertale creator on the games that served as inspiration, changes during development, and more (@NE_Brian, October 27, 2018.) Nintendo Everything.
  21. Q: What do you use to make UnderTale?

    GameMaker 8 is the game engine.
    FL Studio 10 is used for music, with many free soundfonts and VSTs.
    I use MS Paint for my graphics and Tuyoki uses GraphicsGale.
    - undertale on Tumblr, July 19, 2013.
  22. For the anniversary of UNDERTALE, we always try and put on some sort of special event. - Undertale/Deltarune Newsletter, ISSUE 1 - Winter 2022
  23. Tomorrow, on UNDERTALE's anniversary, let's have a fun time. I am thinking I will open the askbox, and…

    - undertale on Tumblr, September 14, 2016.
  24. US/EU gamers can purchase the UNDERTALE PS4 Dynamic Theme from the PSN today. - @UnderTale on Twitter, September 15, 2017.
  25. Well, it has been two years now. I would like to announce that we have started working on the UNDERTALE ALARM CLOCK APP FOR IPHONE/ANDROID. - undertale on Tumblr, September 15, 2017.
  26. Today marks 3 years since UNDERTALE came out.

    Even now, there are still people playing the game and its music... and soon, with Nintendo Switch version, even more people will play it for the first time.

    I'm amazed such a small RPG could have a lifespan like this.

    Thank you.
    - Toby Fox (@tobyfox) on Twitter, September 15, 2018.
  27. 4 years ago today, UNDERTALE was released for the first time on PC. Thank you, everyone for all your support. Because of your passion, all sorts of incredible things have been able to happen... (like the smash thing lmao) - @UnderTale on Twitter, September 15, 2019.
  28. Happy 5th Anniversary!
    The UNDERTALE website was updated.
    🐕👉Update on DELTARUNE's Status
    🐕👉New character dialogue [from the Alarm Clock]
    🐕👉Line Stickers
    ❗Don't miss the concert and new merch at 7PM PDT! https://undertale.com
    - @UnderTale on Twitter, September 15, 2020.
  29. The dialogue on this page was originally intended to debut in the UNDERTALE Alarm Clock, an app that would have served as the vehicle for various humorous monologues from the characters. Development on the app has halted due to various circumstances, including asking the app developer to help with the development of DELTARUNE instead.

    So, rather than have the dialogue gather dust, I have taken an excerpt and rewritten it for display here.

    As always, it's recommended you don't read this dialogue until you've completed UNDERTALE.
    - undertale.com/alarmclock/
  30. UNDERTALE's 5th Anniversary concert starts in 45 minutes! In the meantime, feel free to come... hang out as time counts down! - @UnderTale on Twitter, September 16, 2020.
  31. Thanks for listening to my messy piano playing at the end too. The first piece was an arrangement of a song from DELTARUNE, the last two were UNDERTALE songs with improvisations. The middle one especially (Snowdin arrangement) I just randomly made up for the concert - Toby Fox (@tobyfox) on Twitter, September 16, 2020.
  32. It's UNDERTALE's 6th anniversary! To celebrate, we've created even more wacky LINE stickers which cover increasingly obscure use cases. Check it out! - @UnderTale on Twitter, September 15, 2021.

External Links