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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.

Contains (or is themed around interacting with) a musical score, soundtrack, or backing track(s).

The larger universe outside of Earth's atmosphere. Sometimes really, really far outside of it.

Games where the primary goal is keeping the player character alive under harsh circumstances such as dwindling resources or a hostile environment.