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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. 

Programs that typically run in the graphics pipeline directly on the GPU to apply special effects to graphics

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