Open Source Videogames
Video version of list Link to heading
Main list Link to heading
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osu!- Rhythm game ( I reccommend new version osu!lazer because of new features and linux port) 
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Sonic Robo Blast 2 - 3D Sonic platformer with sprite-based graphics 
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SuperTuxKart- Arcade racing 
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Xonotic - Quake-like arena shooter 
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Mindustry - Hybrid factory managmnet, tower defence and real-time strategy (I reccommend playing on a new planet as it’s much more polished and cool) 
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Minetest - Voxel Game engine (cubic sandbox game) - for games see #Minetest