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Games in which the player shoots things to progress, usually with a variety of guns, and other times with bows and arrows.

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

Science-fiction. Commonly including things like aliens, advanced technology, and settings of outer space or distant planets. 

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