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Games that aim to startle and unnerve the player.

"Old School Renaissance" or "Old School Revival." Tabletop RPGs that are inspired by the early tabletop RPGs of the 1970s

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.