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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.

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.

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.