Superworld

Superworld is a superhero-themed role-playing game published by Chaosium in the 1980s. Written by Basic Role-Playing and RuneQuest author Steve Perrin[?], Superworld started life as one third of the Worlds of Wonder[?] product, which also included a generic fantasy setting, "Magicworld", and a generic science fiction setting, "Spaceworld", all using the same core Basic Role-Playing rules. Only Superworld became a game in its own right.