Dungeon Keeper is a strategy video game developed by Bullfrog Productions and released by Electronic Arts in June 1997 for MS-DOS and Windows 95. In Dungeon Keeper, the player builds and manages a dungeon, protecting it from invading hero characters. The ultimate goal is to conquer the world by destroying the heroic forces and rival dungeon keepers in each realm. Multiplayer with up to four players is supported using a modem, or over a local network.