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Napstablook's name may be a play on "Napster bloke," in reference to the file-sharing software Napster, which was frequently used to share music files. The computer in Napstablook's house also displays "a music-sharing forum".
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If the player attempts to buy a hotdog from Sans while their inventory is full, he will place a hotdog on the player's head. Sans will continue stacking hotdogs on the player's head until they have a stack of 29 hotdogs on their head.
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The track "The Choice" almost exactly matches the track "Undertale" when sped up by 666%.
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Temmie's weird speech patterns seem to be inspired by Mr. Saturn from the Mother series.
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The markings seen on Papyrus' chestplate are the same markings seen on the Starman's chest from Earthbound.
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Undertale has two secret endings that can be seen by doing a Spoiler:Pacifist Run after a Genocide Run. If the player chooses to stay with Toriel, Chara's face appears on Frisk and a lower pitched version of Flowey's laugh plays. If the player chooses to leave, the picture of Frisk and friends is replaced with a picture of Chara in Frisk's place and big Xs appear on other characters. This may be implying that Chara killed them after the game. The only way to get the true pacifist ending back is to either modify or replace the game's save files.
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There is a hidden ending that can only be accessed by skipping directly to the credits. In it, Sans says that it is most likely an error handler, but that the player probably got there by cheating. He then calls the player a "dirty hacker."
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In the fight with Spoiler:Sans, if you try to spare him after he spares you, he offers you a hug. After the dialogue boxes that arise afterwards, you get attacked by undodgeable white bars and get a Game Over screen with Sans saying "geeettttttt dunked on!!!".
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Originally it was planned for Spoiler:Mettaton to save images of your essays to your hard drive, the feature was removed from the final version because it was too buggy.
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The spider boss Muffet was designed by Michelle Czajkowski, creator of the webcomic Ava's Demon.
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The song known as "Dogsong" was made by using the soundfont from Mario Paint's music mode, although some notes in the song are too low to recreate it in the normal music mode.
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When Undertale was announced as a kickstarter project it was originally aiming for $5,000 to create the game. The campaign succeeded by going over that with $51,124 with the help of 2,398 backers.
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Attempting to give the main character a name already in use will prompt a unique response from that character. While certain enemy names are acceptable, the names of story-important characters are forbidden.
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