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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...

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Latest posts from @mossmouth

RT @AliasMcSafe: Hello, I'm Alias McDoe and I do fighting game style animations, and I'm also working on my own game (link in bio).… T.co

Jul 11 2023

Great news! Incredibly fun, powerful beat 'em up with some top tier pixel art. One of the playable characters is bi… T.co

Jul 11 2023

RT @messhof: Here's a teaser for our new game "Ghost Bike"-- working with @A_i Youtu.be Ghostbikethegame.comT.co

Jul 10 2023

FYI, #Spelunky2 is leaving #GamePass this week on July 15th (Xbox and PC)! Last chance to try the game or make use… T.co

Jul 10 2023

RT @BossFightBooks: SPELUNKY by @mossmouth made @verge's Greatest Tech Books of All Time list! "Yu is extremely specific in this book… T.co

Jun 30 2023

Currently on sale on Steam: #Spelunky (80%) and Spelunky 2 (50%)! ⛏️https://store.steampowered.com/publisher/mossmouth Also, a lot of great… T.co

Jun 29 2023

RT @jwaaaap: Super excited to announce Ridiculous Fishing EX! An expanded remaster of the 2013 classic coming to Apple Arcade on… T.co

Jun 27 2023