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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.

Set in a fictional universe, often (but not always) with fantastic or supernatural elements, alternate worlds, magic and monsters.

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

Unity is a game engine for 2D, 3D, AR and more