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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.

For that old school look and feel.

Science-fiction. Commonly including things like aliens, advanced technology, and settings of outer space or distant planets. 

A perspective where the camera is placed directly above the player. Common in 2D games, but can also be used in 3D games.