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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.

PROCJAM is the Procedural Generation Jam, an annual event about making things that make things.

http://www.procjam.com/

Sprites are generally 2D images used in games to represent objects. They can be animated or static, and come in different styles like isometric or top-down.