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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.

A game in which the player is not constrained to achieving specific goals and has a large degree of freedom to explore, interact with, or modify the game environment 

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