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Heroes Unlimited RPG

Superhero Roleplaying

Ninjas & Superspies RPG

Anime/Japanese-Style Superhero Roleplaying

see also Teenage Mutant Ninja Turtles & other strangenesses RPG books - particularly compatible with Heroes Unlimited (and with Ninjas & Superspies), though all Palladium RPGs share the Palladium RPG system;
the magazine for all Palladium rpgs is Rifter

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