Undertale is a game where you play a character and make choices. It was made by a small game maker named tobyfox and came out on September 15, 2015 for computers.
The game logo has a font that looks like it’s made up of tiny squares, and it’s almost the same as a font called Monster Friend made by Harry Wakamatsu from Japan. Monster Friend comes in two types: Monster Friend Fore and Monster Friend Back. You can use them together to create the Undertale logo.
You can get a free download of Undertale Font here. It’s in the OTF (OpenType) Format and you can use it for personal and commercial purposes without paying.