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Uses two-dimensional "sprites", 2D images created and used on a flat plane, as opposed to the three-dimensional models or environments found in 3D games.

Near infinitely replayable games that usually feature, random generation, perma-death, and brutal difficulty. 

Similar to roguelike games but generally with simpler or more forgiving rules & mechanics.

Games where the primary goal is keeping the player character alive under harsh circumstances such as dwindling resources or a hostile environment.