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Games that challenge the player with critical thinking to solve levels. 

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.

Ludum Dare is a 48 and 72 hour game making competition globally hosted over the internet; Ludum Dare 33 ran from August 21st to August 24th, 2015, with the theme "You are the Monster".