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Typically a graphical style where there are one two colors. (A bit can be either on or off, so two options) Commonly black and white, but can be any combination depending on the style the creator is trying to accomplish. 

Simple, fast-paced games with colorful graphics and catchy audio, that require few or no explanations, can be played in short bursts, and usually require a lot of skill. Similar in style and spirit with the arcade game cabinets of the 80s and 90s.

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.