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"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. 

Subgenre of Horror, where player's character is usually more vulnerable and under-armed, usually focusing on evasion, stealth and/or puzzle-solving, rather than combat.