From the publisher's website Hideouts & Hoodlums is a modification of the Swords & Wizardry rules from Mythmere Games. What the Open Game License has allowed me to do is make a game as close to the original fantasy roleplaying game as possible BUT with swords and sorcery elements expunged and replaced with elements of the Golden Age of the superhero genre, circa 1939. User comment Underworld and Metropolis Adventures is the third book in the Core Rules series for Hideouts and Hoodlums RPG.