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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.

Games with big boss battles, or even games that are just boss battles.

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

A perspective where the camera is placed directly above the player. Common in 2D games, but can also be used in 3D games.