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Taking place after a huge catastrophe (eg. man made or natural disaster). See also the more political theme dystopian.

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.

Also known as TTRPG, tabletop role-playing games are tabletop games when you play a character within a set of rules. Typically actions are determined by speech and checked for success via dice rolls.