Warhammer 40,000 is a tabletop miniature wargame produced by Games Workshop, set in a dystopian science-fantasy universe. Warhammer 40,000 was created by Rick Priestley in 1987 as the futuristic companion to Warhammer Fantasy Battle, sharing many game mechanics. Expansions for Warhammer 40,000 are released periodically which give rules for urban, planetary siege and large-scale combat. The game is in its seventh edition, which was released on May 24, 2014 (notably, less than two years after the release of the sixth edition). Players can assemble and paint individual, 28 millimetre (approximately 1 inch) scale miniature figures that represent futuristic soldiers, creatures and vehicles of war. These figurines are collected to compose squads in armies that can be pitted against those of other players. Each player brings a roughly equal complement of units to a tabletop battlefield with handmade or purchased terrain. The players then decide upon a scenario, ranging from simple skirmishes to complex battles involving defended objectives and reinforcements. The models are physically moved around the table and the actual distance between models plays a role in the outcome of combat. Play is turn-based, with various outcomes determined by tables and the roll of dice. Battles may last anywhere from a half-hour to a whole weekend, and battles may be strung together to form campaigns. Many game and hobby stores host games, and official tournaments are held on a regular basis, such as the Throne of Skulls.