Undertale Yellow (stylized as UNDERTALE YELLOW) is a turn-based role-playing game based on Toby Fox's Undertale. The project is led by Master Sword and is developed on GameMaker: Studio. Greenlit by Toby, it is notable for having famous faces behind the game's soundtrack, such as NoteBlock, MyNewSoundtrack, and Master Sword himself. It is currently in development, with the first version of the demo having been released on November 30th, 2016.