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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

Near infinitely replayable games that usually feature, random generation, perma-death, and brutal difficulty. 

Related to the process of arranging game maps using a set of tile graphics (often call tilesets)