The Game Genie is a line of cheat systems originally designed by Codemasters and sold by Camerica and Galoob. The first device in the series was released in 1990 for the Nintendo Entertainment System, with subsequent devices released for the Super NES, Game Boy, Sega Genesis/Mega Drive, and Game Gear. All the devices temporarily modify game data, allowing the player to cheat, manipulate various aspects of games and sometimes access unused assets and functions.