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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.

Dystopia is a very dark future, the opposite of utopia. May contain, but is not limited to,  themes like chaos, pollution, censorship, dictatorship.

Taking place after a huge catastrophe (eg. man made or natural disaster). See also the more political theme dystopian.