Deltarune Wiki

Deltarune (stylized as "DELTARUNE" and "deltarune") is the second game released by Toby Fox. Chapter 1 was released for free on October 31, 2018, and the soundtrack two days later. Chapter 2 was officially announced on September 15, 2021 and was released on September 17. Additional chapters are expected in the future, although there is currently no release window.[1]

Deltarune serves as a follow-up to Toby Fox's successful game Undertale, and is intended for those who have finished it.[2] While Deltarune showcases a return of many characters from Undertale, as well as a similar gameplay, the game is set in a different continuity.

Deltarune was released on 28 February, 2019 for the Nintendo Switch and PlayStation 4.[3][4] Chapter 2 was released on September 23, 2021 as a free update.[5][6]


Chapter 1[]

Chapter 1, titled The Beginning starts with the player creating a vessel that is abruptly discarded. Instead, they inhabit a vessel who they cannot choose: Kris. They are a quiet human teenager who lives with their mother Toriel and go to the local school in Hometown. After being assigned a tall reptilian student, Susie, as a partner for a school project, she threatens to eat their face. They are forced to team up and go to the school supply closet.

Upon opening it, the duo inadvertently discover the Dark World inside. There, they meet Ralsei, a kind hearted Boss Monster-like Dark Prince, who reveals that the three of them are the heroes of the Prophecy, destined to restore balance to light and dark. During their adventure, they meet Lancer, a goofy bad guy. Feeling undervalued, Susie leaves Kris and Ralsei for a time and teams up with Lancer. Susie's friendship with Lancer helps her become more compassionate. The whole cast ends up uniting into a single team of four. In the end, Lancer helps the trio overthrow his cruel father, King. Afterward, Kris and Susie say their goodbyes to the Dark World, and, using the power of Kris's human SOUL, they seal the Eastern Fountain.

Kris and Susie return to their world together, appearing in a room filled with toys and board games, representing the Dark World and the characters they met. Kris and Susie agree to return to the Dark World the next day. Kris can leave the school and explore Hometown.

Kris goes to sleep after exploring the town. In the middle of the night, Kris shambles out of bed, seemingly fighting just to walk. They rip out their SOUL and throw it into a birdcage, where it becomes trapped. A knife materializes in Kris's hand, and they look at the camera with a menacing smile. The screen then goes completely black for a few moments before the credits play.

Chapter 2[]

The second chapter, titled A Cyber's World, begins with Toriel calling out to Kris. She then discovers a knife and acts shocked. However, it is almost immediately revealed that this is because Kris ate all of the pie she had baked the day before.

Kris wakes up, goes to school and enters the Dark World again with Susie. They meet Ralsei and explore the Castle Town, which has been significantly expanded by the addition of NPCs from Chapter 1. Eventually, Susie mentions they have homework to do, prompting Ralsei to banish them from the Dark World until their homework is done.

They go to the Library, where they find another Dark World, the Cyber World, awaiting them, and jump into it, this time after Noelle and Berdly. They hear talk about a Queen, who acts as the main antagonist for this chapter, and meet her soon after. She captures Noelle, while Berdly switches to her side voluntarily. Eventually, Kris splits up with the other party members and teams up with Noelle. In Kris's company, Noelle starts to learn to be less fearful, accentuating one of the game's themes of personal development. Later, after the entire party gets thrown into Queen's dungeon, Berdly learns to be less arrogant after failing to solve multiple puzzles. The final boss fight begins with both parties turning into mechas, and then combat proceeds in the style of a Punch-Out!!-esque fighting game. Kris seals the Dark Fountain of this world, and the Lightners all return to the Light World.

After walking through town, Kris goes home and Toriel invites Susie to spend the night at her house. She sends the pair to wash their hands. When Kris goes to the bathroom, they rip out their SOUL again and escape through the window, leaving the player to listen to a chat between Toriel and Susie. Eventually, Kris returns to the bathroom and puts their SOUL back in their body.

After Susie and Kris fall asleep while watching TV, Toriel calls the police to inform them that she saw something outside the house and found her car tires slashed. After that, Toriel also falls asleep in the living room. Then, in the middle of the night, Kris wakes up, and, with their knife, creates a Dark Fountain that envelops the entire room in black mist. The last thing that can be seen is the static television screen and a ghoulish smile on it. Then, the screen goes completely black for a few moments before the credits play.

Future chapters[]

The third and subsequent chapters are still in development. Chapters 3, 4 and 5 will release at the same time, bundled in with Chapters 1 and 2. Toby Fox has stated that they will be priced more than Undertale.[1] Additionally, the existence of Chapters 6 and 7 is indicated on the main menu of the game when selecting between Chapters 1 and 2.

Differences from Undertale[]

  • Unlike Undertale, Deltarune allows keeping 3 save files at the same time, and does not offer a RESET option. However, save files can be erased through the game itself.
  • There is now the possibility to run by pressing X, or enabling Auto-Run in the game's settings.
  • Enemies appear in the overworld as obstacles as opposed to Encounters being randomized.
  • It is not possible to flee from battle.
  • The in-game menu is much more complex, with game settings, detailed stats/equipping, and different types of items.


Toby Fox credits his 2012 inspiration for making an RPG, leading to both Undertale and Deltarune, to the unique art of kanotynes, who designed Lancer, Rudinn, Clover, Hathy, King, Jevil, and the uncredited King of Diamonds. While Fox's first RPG became Undertale, his original game idea associated with kanotynes's character designs would later become Deltarune.[7] kanotynes's designs for Lancer, Rudinn, Clover, Hathy, and King were part of a set of 52 unique playing cards which she had devised as a project for a design class, with the full set being complete by March 29, 2012.[8]

Temmie Chang, who previously worked on Undertale, also worked on Deltarune's first chapter, contributing more graphics than she had for Undertale. She is credited as "Main Artist, Animator, & Cleanup" on Background, Overworld, Battle, Sepia and Menu Art.

keiko_fukuichi, a translator at 8-4 Ltd who also worked on Undertale, translated the game into Japanese.

Fox found Laura Shigihara, who sang and arranged the ending ballad Don't Forget, through Kan Gao's To the Moon.

With no prior warning, Chapter 1 of Deltarune was teased for one day on the Undertale Twitter before its release on October 31, 2018. On release, the game was disguised as a survey regarding "something new" Toby Fox had planned, saying it would "all start with [the players'] feedback." As such, the game's folders and shortcuts are named "SURVEY_PROGRAM" by the installer, although the actual game executable is called "DELTARUNE." Toby Fox stated he really wanted players to believe the game was related to Undertale, so he tried to imitate Undertale at the beginning of Deltarune, even going as far to make two different choice menus.[9]

Players were asked to refrain from discussing what was in the game, or even what it was, for twenty-four hours after the release. On November 1st, 2018, Fox made the chapter's soundtrack available on Bandcamp.

Unlike the first demo for Undertale, the creation of Deltarune's first chapter took a few years, and a full version would likely take over 7 years for Fox to complete as "a single person (and Temmie)". He has therefore floated the idea of assembling a team to work on the game with him. Fox does not intend to make a Kickstarter campaign for Deltarune, and plans to release all potential remaining chapters simultaneously as a single-purchase game if it is completed. There is currently no projected timeline for the game's release or information about what platforms it will support, and some things about Chapter 1 may be changed prior to a full-game release[10], though the game is actively being worked on.[11]

However, on September 15th, 2021 during a YouTube livestream celebrating Undertale's 6th Anniversary it was announced that Chapter 2 of Deltarune would release on September 17th, 2021 for PC and Mac.

Following the release of Chapter 2 Fox stated that the game's third, fourth, and fifth chapters would be released as a single paid title once completed with no details being provided of chapters 6 and 7.[12]

In a tweet posted by Fox in May 2022 he stated that development of Chapters 3-5 were going well and said he has hired more people to help with the game's development.[13]


  • Deltarune is an anagram of Undertale.
  • The deltarune logo has no capitalized letters, in contrast to UNDERTALE, which is in all caps. Despite this, any in-game mention of the game's namesake is always in all caps.
  • Toby Fox has stated that the events of Deltarune are separate from Undertale, being neither a sequel nor a prequel but rather taking place in an alternate world.[10] Despite this, it has been suggested that there may be connections between the two games, with Deltarune being presented as part of the UNDERTALE series in store descriptions.[14][15]
  • The Delta Rune is an emblem found displayed across the worlds of Deltarune and Undertale. In Undertale, it represents the legend of the angel that will empty the underground while in Deltarune, it represents the heroes of Ralsei's prophecy.
  • Toby Fox stated that the ending will be the same no matter what the player does, however this is followed by a question mark in the steam and store pages for the Deltarune Chapter 1 and 2 demos, which suggests there could actually be more than one ending to the game.[10]
  • The user agreement that appears when running the installer for Deltarune only has a single, unexplained line that states that the player will "ACCEPT EVERYTHING THAT WILL HAPPEN FROM NOW ON."


  1. 1.0 1.1 DELTARUNE Status Update - Sept 2021 -
  2. This is intended for people who have completed UNDERTALE. -
  3. DELTARUNE, the next game from the creator of #Undertale, is coming to #NintendoSwitch #eShop! Play DELTARUNE Chapter 1 for FREE on 2/28! - @NintendoAmerica on Twitter, February 13, 2019.
  4. The first chapter of Deltarune, the next game from Undertale creator Toby Fox, is coming to PS4 on Feb. 28 — for free! - @PlayStation on Twitter, February 21, 2019.
  5. DELTARUNE Chapter 2 will be available today on #NintendoSwitch as a free update to DELTARUNE Chapter 1! - @IndieWorldNA on Twitter, September 23, 2021.
  6. Surprise! Deltarune Chapter 1&2 is also available on PS4 as a free update to Chapter 1! - @UnderTale on Twitter, September 23, 2021.
  7. By the way, you may have seen in the credits of DELTARUNE, but without other people's help, I couldn't really have put the game into existence. So, let me name a few people. - Toby Fox (@tobyfox) on Twitter, November 02, 2018.
  8. The reason I made them in the first place was for my design class though. - kanotynes on Tumblr, March 29, 2012.
  9. UNDERTALE 6th Anniversary So We Play DELTARUNE Chapter 1 For Some Reason - LIVE! - YouTube
  10. 10.0 10.1 10.2 Here are my thoughts on Ch 1 of Deltarune. This should answer some questions. - Toby Fox (@tobyfox) on Twitter, November 02, 2018.
  11. If you ever wonder what I'm doing, I'm vibrating rapidly and working on my game. Every year it doesn't come out I shake more. I don't want it to take too long, but after a few more years I can clip into the floor while doing an ollie and earn tons of points, so it's not all bad - Toby Fox (@tobyfox) on Twitter, February 26, 2020.
  14. It's a different world that might even have different rules. That doesn't mean there will be no connections at all though. - Deltarune FAQ
  15. The next adventure in the UNDERTALE series has appeared! -