The Game Genie is a line game Cheat cartridges 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, Genesis, and Game Gear. All the devices temporarily modify game data, manipulate various aspects of games, and sometimes access unused assets and functions. Five million units of the original Game Genie products were sold worldwide, and most video game console emulators feature Game Genie code support. Emulators that have Game Genie support also allow a near-unlimited number of codes to be entered whereas the actual products have a much smaller limit, between three and six codes.
The Game Boy edition similarly has a slot for cartridges while itself needing to be inserted into the console's game slot. It has two face buttons for toggling codes on/off or to return to the code input screen, and it houses a compartment to contain a very small code booklet in the back.
The physical design made it difficult to be used with any version of the Game Boy other than the original. Although it could be made to work, if one attempted to use the Game Genie on the Game Boy Pocket or Game Boy Color, they would find the large top portion of the Game Genie would come into contact with the top of the Game Boy Pocket/Color before it was fully engaged. Therefore, the Game Genie would need to be bent backwards, placing strain on the mechanism to allow it to be pressed down far enough to reach the Game Boy Pocket/Color cartridge contacts. Despite this history, it will work fairly well with the Game Boy Advance SP. A standard unit will not fit in a Super Game Boy, but with some minor modification to the plastic, it will fit and work normally. There was also a third party "Super Game Boy to Game Genie Adapter", allowing the player to connect the Game Genie to a Super Game Boy cartridge.
The unit is also not compatible with Game Boy Color cartridges (which will not physically fit into the unit). This, however, includes original Game Boy games with Game Boy Color enhancements, when played in a Game Boy Color or Game Boy Advance system. However, color enhanced games will function if played in an original Game Boy system.