The game originally forcibly closed itself at the DELTARUNE-like cutscene. After we restarted our computer, ironically, the game booted immediately into a garbled version of the Once Upon a Time sequence.
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@caramel-cupcakes
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Once Upon A Time (2014)

I'm a person who just likes to mess around, art by @skyribbon_art on twitter, the character is Paula Polestar from Earthbound

IT'S PRONOUNCED "KREETS" !!!
sup I'm david I mean dogvid I mean uh uh uh
sometimes I make music, but usually I reupload stuff that has been deleted or stuff that have not been uploaded to SoundCloud yet

This is an archival project of UNDERTALE as it would have been released before development turmoil in 2014.
While snooping through The Wayback Machine to find anything interesting from the archived UNDERTALE Kickstarter pages, we stumbled upon a very angry comment by an user called ⬛⬛⬛⬛⬛⬛, who claimed to be a former employee of "Toby Fox" that helped him program and sprite a significant portion of UNDERTALE. He claimed that Toby Fox was not cut out to be a game developer due to how he cut corners rather than focusing on expanding on certain game ideas further, and decided to leak this build.
We downloaded the build, but before proceeding we asked Toby himself on Twitter, only resulting in a block plus the swift removal of that page. We are now reviewing the build ourselves (after making sure it's safe) and documenting what we find here. The game actually deletes itself after completing a Genocide Run, and the build starts at the Sans pre-battle, so we are exploring all information we can gather from this section of the game before resetting.
In-Game screenshots have been accurately recreated as much as we could, by GoldenDarius, Boss2Official, and One_Palmtree. 
We've also managed to recover and recreate the soundtrack from this scrapped version of UNDERTALE, with the help of the musicians credited in each description.
(Not official. Go check out @fatum-venit)

I add songs that are not here and I think are good.

Please ignore the tracks on this account, everything sucks here loll

Once Upon A Time (2014)

UNDERTALE²⁰¹⁴