We just released a Feb. 5 '89 prototype of DuckTales for the NES!
If you'd like to support our preservation efforts (and this wasn't cheap), please consider donating or supporting us on Patreon. Thank you!


From The Cutting Room Floor
Jump to navigation Jump to search
This page contains changes which are not marked for translation.
Other languages:
English • ‎中文(中国大陆)‎ • ‎日本語 • ‎한국어

This page details prerelease information and/or media for Undertale.

To do:

Undertale was obliquely teased as "Underbound 2" in February 2013 before being released as an official demo of Undertale that May. It then recieved a Kickstarter page, where backers originally kept track of the game's progress before the eventual release in 2015. Judging from the developmental process, the foundation for the game was pretty much laid out save for a few minor layout changes and redone graphics.

Ever since the game's release, it had gained an immense following over the years which allowed Toby Fox to include new additions via updates and develop another game in the series called Deltarune.


Undertale Papyrus concept art.png
Concept Art


In December 2012, Toby Fox started to develop Undertale after he clicked on a random article on Wikipedia and ended up on a page about arrays. Back then, he studied about basic programming variables in RPG Maker 2000 by reading books, but he did not know how to code a full-scale game. The game's original idea, dating back to early 2012, ended up being released in 2018 as Deltarune.

He stated in an interview that the "Action" and "Quit" commands were inspired by Shin Megami Tensei, in a same vein to interacting with monsters.

(Source: Famistu Interview)

Development Timeline


  • February 4: Toby Fox replies to a member on Starmen.net, and shows the very first image of "Underbound 2", actually from an early version of Undertale.
  • May 2: An earlier version of the demo is showcased in a Fangamer stream.
  • May 23: The demo of Undertale was released to the public.
  • June 24: The Kickstarter page for Undertale opens.[1]
  • July 24: The Kickstarter page for Undertale is closed, having raised a total of $51,124.[2]


  • February 21: Toby states that the game is "approaching 50% completion", but hasn't had much time to program the game due to schoolwork causing development to go on hold.[3]
  • May 3: Development of the game resumes, as Toby graduates from university. Additionally, a Korean version of the demo is released.[4]
  • June 25: Toby reveals that "Area 3" of the game (actually Waterfall) is complete, and claims that "Area 4" (i.e. Hotland) will be the last one finished.[5]
  • August 31: "Area 4" of the game is halfway complete, and Toby shares some other progress in the game itself.[6]
  • October 30: "Area 4" is mostly complete, with some glitches being fixed.[7]
  • December 18: Toby finally finishes Asgore, which he claims to be the "final boss" of the game.[8]


  • January 15: A new trailer is released on Steam Greenlight.[9]
  • February 22: A small update is released, stating that since the last one, "an ending", "the last date", "a very pathetic shopkeeper", and "a nice place with a shower, air conditioning, and a bunch of fun movies to watch" have been added.[10]
  • May 1: Toby sends a late build of Undertale to some select backers, which plays like the normal game except for a couple of missing features, like "one ending not being beatable".[11]
  • May 30: By this point, the last ending is "almost complete", with only one boss in the route being unfinished. Various other minor things were added.[12]
  • June 30: Since the last update, Undertale has been mostly converted to Game Maker Studio. As a result of this conversion, the instruction manual was left unused.[13]
  • July 30: Toby claims that the game is almost complete and mentions a "possible August" release.[14]
  • August 22: The game's release date is unveiled as September 15, 2015.[15]
  • September 8: Toby posts the release trailer of Undertale, one week from the game's release.[16]
  • September 15: Undertale is released.

Starmen.net Reveal

On February 4, 2013, Toby posted a joke reply in a friend's forum thread on Starmen.net, in which he claimed to be working on a sequel to the (likely also a joke) EarthBound hack "UnderBound", titled "UnderBound 2". The images and music shown were in reality from an early version of Undertale, and feature several differences from their final versions.

TestMonster? All I see are Froggits!

The image on the right shows the earliest revealed screenshot of the game. While most of it looks similar to how the final game looks, the options at the bottom are different, with a "Talk" choice instead of "Act", "Spare" instead of "Mercy", and a "Spell" option that's not in the final (its graphics are present but unused, however). No visible LV meter has been implemented. The Froggit enemies are called "TestMonster", and the spots on its chest are slightly different than the final's.

Look at 'em go!

Frisk originally had black outlines and darker hair and shoes. This was changed to a lighter brown in the final.

Pre-release Final

The regular battle theme, "Enemy Approaching", was one of the earliest tracks written for the game. The version from the PK Hack thread is slightly incomplete, notably missing the outro the final has and the beep-y instrument from 0:21 on.

(Source: PK Hack (archive))
Pre-release Final
More likely to break a bone than a fall. A (flower) bed fit for a queen.

Compared to the final, the early version has blockier graphics. LV is next to the player's name, and there is an extra stat EN, which Toby says stands for English, though more likely stands for Energy, which is an unused stat in the demo's code.

(Source: @tobyfox)
Pre-release Final
I'm sure a lot of people would've quit the game here. Better.

Dated April 5, 2013 (one month before the demo release), this leaf puzzle was made a bit easier in the final version. Other parts of the ruins were also lacking markings or cracks on the ground at this point.

(Source: @tobyfox)

oh god no

Toby testing stuff out (February 8, 2013). The font used is wider than in the final.

The room shown here still exists in the final as "room_overworld", but the textures used were deleted, resulting in black space.

(Source: @tobyfox)

All I said was "snails"...

Happy Toriel with no horns. The original Boss Monster design lacked horns, but they were added because Toby felt it made them look too much like mimigas from Cave Story (a noted inspiration).

(Source: @tobyfox)

It's not like I killed anyone or anything.

Sad Toriel with no horns.

(Source: @tobyfox)

Early Sprites

Hoi. Welcome to da TEM SHOP.

It's the Temmie Shop in a overworld sprite form.

(Source: Temmie Chang @tuyoki)

So sorry you couldn't see this for so long...

Temmie Chang made an overworld sprite of So Sorry from the front, but it was not used until later versions of the game, where he appears outside of the Art Club room in the True Pacifist epilogue only after fighting him.

(Source: Samael on Tumblr)

Bandcamp Demo Soundtrack Differences

To do:
  • The "Start Menu" combines four tracks into one for some reason. Split this track up and compare it to the unused "Start Menu" tracks in the demo.
  • The final game's Bandcamp soundtrack has differences in it as well.

The demo's soundtrack on Bandcamp features a few musical differences compared to the demo.

"Fallen Down"

Bandcamp Demo

This track is used when you first meet Toriel. The Bandcamp version is a slowed down, lower-pitched version of the demo's version in the files, which in turn is slowed down, and lower-pitched in-game.

(Source: tobyfox.bandcamp.com)

Hotel Battle Music Pre-Release Name

The song on the OST "Can You Really Call This A Hotel, I Didn't Receive A Mint On My Pillow Or Anything" was named "Hey This Wasn't Really What I Was Expecting From a Hotel, For Example You Didn't Even Leave a Mint on My Pillow" when revealed in a Kickstarter update, and has the filename "hey_this_wasnt_really_what_i_was_expecting_from_a_hotel_for_example_you_didnt_leave_a_mint_on_my_pillow.mp3" on Toby Fox's website. It was uploaded on October 30, 2014 at 8:58 AM.

(Source: Kickstarter)

"Stronger Monsters" WIP

This prototype version of "Stronger Monsters" is found on Toby's website, as well as in a Kickstarter update. The only major difference seems to be that the end is shorter. It was uploaded on December 18, 2014 at 8:16 AM.

Compare the end of this track with the final:

WIP loop/end of "Stronger Monsters" Final loop/end of "Stronger Monsters"

Unreleased Music

Various unreleased music tracks were posted to the Undertale Tumblr the day before the game's 1st Anniversary.

Early "Alphys"

A calmer, less quirky-sounding version of Alphys's theme. It was rewritten for the final version because Toby felt it was too similar to "a certain lab song from another game" (most likely referring to Dr. Andonuts' lab theme from EarthBound). "Here We Are", the theme for the True Lab, appears to be based on this early theme.

(Source: Toby Fox)

Early "Spear of Justice"

An early version of Undyne's battle theme. Although the melody is mostly the same, it has a considerably more melancholy and less aggressive tone compared to the final version due to being written before Toby "really knew Undyne’s personality".

(Source: Toby Fox)

Early "Undertale"

An early take on the eponymous song. Compared to the final version, this is less bittersweet-sounding and is played in a minor key. Toby was inspired to change the guitar backing to a new melody (which itself served as the basis for "Memory" and "His Theme") after hearing the song "Redline Day" from the 2009 anime film Redline.

(Source: Toby Fox, Toby Fox)

"Dog Hole"

Definitely meant to be an area theme, but it doesn't sound quite like anything else on the soundtrack. Maybe that's why it was scrapped...?

(Source: Toby Fox)


"Dogsong", arranged as a parody of the Metroid ending theme. Apparently, if you completed the game quickly enough you would have gotten an image of the Annoying Dog in a bikini as a "reward":


(Source: Toby Fox)
(Source: @tobyfox)

Mettaton Essay

On Toby Fox's Twitter, he notes that at one point Mettaton would save your essay to the hard drive as an image, but it was buggy, and thus was removed.