Spelljammer is a campaign setting for the Advanced Dungeons and Dragons role-playing game first published by TSR, Inc. in 1989. The Spelljammer setting is unlike any other AD&D campaign setting, because the idea of fantasy-based space travel is its basis. It allows characters to travel not only through space but to other campaign worlds as well using vessels such as a galleon sailing ship, certain fantasy creatures or other types of ships not normally found on the surface of a planet. The Spelljammer universe treats the fantasy realms of the AD&D game as the "real" universe. Magical kingdoms and fantastic creatures do exist and do not interfere, but rather coexist with space travel.