FAQ (and common problems)
Q: I bought the game off of undertale.com. How do I play it/Why can't I find it?
You should get an e-mail containing a link to download the game. If you don't see it, check your spam. Then try Humble Resender to send the game back to yourself in an e-mail. If you can't see the game, you may have misspelled your e-mail and need to contact me or Humble Support.
Q: I bought the game on undertale.com but I logged into Steam and I can't find it!
When you buy the game on undertale.com, you should (as mentioned in the answer above) get an e-mail with a link to download it. You don't need Steam to play it. However, if you do want to put the game on your Steam account, the download page will have a Steam Code on it that you can redeem like this.
Q: I downloaded the game off of undertale.com and need to download it again because (new computer/I lost it/it got deleted.)
Use Humble Resender to send the game back to yourself in an e-mail.
Q: I bought the Game + Soundtrack bundle on Undertale.com and I downloaded UNDERTALE but can't find the soundtrack.
On the page where you click "Windows" or "Mac" to download the game, next to them is a button that says "Audio" with a music note next to it. You have to click on that one. It is a separate download.
Q: How do I listen to the soundtrack if I bought the game on Steam?
This article from Steam should help you.
Q: Will you translate the game to [language].
Currently only a Japanese translation is underway.
I understand there are people in every language who would like to play the game.
I will make an announcement if I plan to do a new language.
Q: Will you do a port of the game to Linux.
I did it already! Who are you!?
Q: Will you do a port of the game to consoles/mobile/etc.
I don't know. Please don't e-mail me about this.
Q: What do you use to make the music?
FL Studio. I often write the melodies and chords using a keyboard first.
Q: What did you use to make the game.
Game Maker Studio.
Q: What did you use to draw the graphics.
MS Paint. Temmie and other artists used GraphicsGale.