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UnderWorld is a ROM hack of Super Mario World developed by cyphermur9t and released in 2017. In this hack, Mario finds himself in the world of Undertale!

Where does Mario go when he dies? When one of his deadly falls goes awry, he ends up in the UnderWorld.

This hack is more centered around the story than the platforming. Since this modification is story-driven, there will obviously be a lot of text. Additionally, almost all of the graphics have been custom-drawn.