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Using only symbols available in the "ascii" set of characters

"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.

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