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

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

Utilizing content created by algorithms rather than human made content. Often utilizes a "seed," a relatively small string that is used to control the randomization algorithm that generates the entire world.

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