Dungeon Keeper is a strategy video game developed by Bullfrog Productions under Peter Molyneux and released by Electronic Arts in July 1997 for the PC in which the player attempts to build and manage a dungeon or lair while protecting it from invading 'hero' characters intent on stealing the player's accumulated treasures and killing various monsters. This was Molyneux's final project with Bullfrog before he left the company in August 1997 to form Lionhead Studios.