Peripheral device developed by Codemasters and released by Galoob Toys which allows the user to effectively hack video games for a variety of effects, from such practical things as giving yourself infinite lives or ammo or making you immune to damage to stranger things like [[MindScrew turning Mario into an indistinguishable purple thing that swims through air]]. This is accomplished by entering a series of six-to-eight digit codes onto the startup screen, which will modify the game's data or programming.

The original Game Genie was for the NintendoEntertainmentSystem and allowed you to enter up to [[RuleOfThree three]] codes (sometimes jokingly referred to as [[RuleOfThree three "wishes"]], hence the name "Game Genie"). The peripheral proved popular despite Nintendo's disapproval (lawsuits hated the sales of the SNES version on the grounds that they were piracy tools, and they even built a feature into the top-loading NES that prevented Game Genies from working) and versions of the Game Genie appeared for the GameBoy, GameGear, SegaGenesis, and SuperNintendo (and possibly some other systems). Some of these allowed five "wishes" instead of three.

Game Genies usually came packaged with a book containing codes, and users could subscribe and receive regular updates. In addition, more inquiring gamers would attempt to find their own codes. These days, there are websites where users log and attempt to create Game Genie codes. Most console emulators feature an emulated Game Genie as a built-in option.

The Game Genie [[FollowTheLeader spawned]] [[TheRival one competitor]], the Pro Action Replay, which worked in a similar fashion. Both peripherals were retired at the end of the 16-Bit generation. The equivalent for the 32/64-bit era was the Interact [=GameShark=]. The next generation of ConsoleWars, dominated by the PlayStation2 and XBox, benefited from a new generation of the Action Replay, as well as the Pelican Accessories Code Breaker. No off-the-shelf tool permits similar enhancement to the Wii, PS3, or {{XBox 360}} at this time, and with the upswing in online console gaming and remote hardware verification, they may not ever be back and may end up being DeaderThanDisco. Much of this has to do with consoles running like modern operating systems which can restrict programs from accessing memory arbitrarily. In the wrong hands, especially in internet connected devices, this would allow arbitrary code to be executed and possibly break things. However, someone did buy the Game Genie label to a save game editor program.

As such, the Game Genie and related devices have become a footnote in the history of gaming, remembered mostly by nostalgic gamers as a life-saver in the days of NintendoHard.
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