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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 2

Spelunky 2

Roguelike

Spelunky returns in this greatly-expanded sequel to the original roguelike platformer! Meet the next generation of explorers as they find themselves on...

Spelunky Classic

Spelunky Classic

Platformer

"Legends speak of a Colossal Cave that extends deep underground, so twisted by time that its passages shift like the sand under which it lies... the Cave...

Spelunky

Spelunky

Platformer

You may have seen Spelunky mentioned somewhere and asked yourself "What's Spelunky?" A unique platformer with randomized levels that offers a challenging...