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...

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Twitter

Latest tweets from @mossmouth

RT @DmitryDeceiver: sketch author - @maja42106905 #pixelart T.co

Sep 24 2021

Bayonetta is so cool.

Sep 23 2021

Neat! T.co

Sep 23 2021

Update about #Spelunky2 crossplay: the plan is to release a private beta on Discord in the next couple weeks to try… T.co

Sep 22 2021

Happy #DarkSouls10thAnniversary! Lots I could say about my fave game, but I'll just express my appreciation for its… T.co

Sep 22 2021

RT @jimmy_knives: 🪓 I WANT YOUR SKULL 🪓 T.co

Sep 21 2021

RT @_groomp: Just beat the Spelunky Classic Any% WR which stood for 11 YEARS! Youtu.be

Sep 21 2021

RT @ShawnDoubleA: It's the week of #GDoCExpo 2021! Running from the 24-26th, online only! We've got something for everyone. 🎤Amazin… T.co

Sep 20 2021