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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.

Pixel Art refers to the charming, simplistic, retro/renaissance style of very-low-resolution graphics, such as from the 1977-1995 Atari, GameBoy, & Super Nintendo (SNES) eras.

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