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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.

Typically shoot em' up games where the emphasis is dodging a large number of bullets on the screen at once. Bullets form dense patterns on the screen that require precise controls to avoid.

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