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

In the style of games made the 8-bit generation of game consoles & computers, or sometimes authentically created to run on original hardware. Common 8-Bit consoles include the Nintendo Entertainment System, Sega Master System, and the Commodore 64

Ludum Dare is a 48 and 72 hour game making competition globally hosted over the internet; Ludum Dare 29 ran from April 25th to April 28th, 2014, with the theme "Beneath the Surface".