GURPS Monsters covers many worlds. Some are listed here. * Monster Hunters * Babylonian Myth * Horror * Norse Myth * Egyptian Myth * Greek Myth * Atlantis * Monsters/Atomic Horror * Aztec Myth * Biotech * Black Ops * Cabal * Cliffhangers * Cyberpunk * Yrth * Illuminati/Monsters * Roman Myth * In Nomine * Old West Horror * Steel * Steampunk * Supers * Swashbucklers * Technomancer * Voodoo * Warehouse 23 * Japanese Myth * Medieval Myth