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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

Using only symbols available in the "ascii" set of characters

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

Games where the primary goal is keeping the player character alive under harsh circumstances such as dwindling resources or a hostile environment.