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My name is Derek Yu. In 2009, I created Mossmouth as my personal studio where I can develop exciting, uncompromising games for dedicated players. I like dense experiences full of surprises waiting to be discovered through fun challenges. I believe that if a video game respects the player and respects its own design, then people will want to play it. That's the kind of game I want to make!

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Spelunky v1.1

Spelunky v1.1

Spelunky Classic Full Version

Spelunky is a cave exploration / treasure-hunting game inspired by classic platform games and roguelikes, where the goal is to grab as much treasure from...

Spelunky Source Code

Spelunky Source Code

Spelunky Classic Source Code

Requires Mark Overmars's Game Maker. Please read the Spelunky User License before downloading. Click "read more" to see the source code license.