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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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Twitter

Latest tweets from @mossmouth

RT @gallerynucleus: 🕹️ Phantasy Arcade is live on our website! Browse through our one of a kind miniature arcade cabinets designed by o… T.co

Jan 27 2023

RT @tostyart: Jan coms repost. gotta keep goin T.co

Jan 27 2023

RT @ASFTUgame: 💫A SPACE FOR THE UNBOUND💫 OUT NOW Follow Atma and Raya on a self-discovery journey at the end of their high school… T.co

Jan 27 2023

RT @devilsblush: scrolling through box art collections T.co

Jan 26 2023

RT @PizzaTowergame: Store.steampowered.com GAME IS OUT!!!!!!!

Jan 26 2023

RT @GamingAlexandri: Uploaded RPG World Map Collection Booklet Appendix in 600DPI from a certain magazine. This is a really neat booklet… T.co

Jan 26 2023

RT @ESanchezIll: John Cruelty (Squad) @CSoftproducts @villecallio T.co

Jan 26 2023

RT @TuckerHuxMurray: This past week I arranged Shoplunky! It's too long, so here's a thread of it- link as well 🍆 It's arrangements I wr… T.co

Jan 25 2023

RT @redbullgaming: .@GrandPOOBear and three experts tried to speedrun @spelunkyworld, but Spelunky speedran them. Spelunky 2 is har… T.co

Jan 25 2023

I love finding out who did the illustrations for the early issues of Nintendo Power! ☺️ T.co

Jan 24 2023