Lewis Galoob Toys, Inc. v. Nintendo of America, Inc.
964 F.2d 965 (9th Cir. 1992), cert. denied, 507 U.S. 985 (1993)
Various models of the Genie produced for different video game consoles. Starting at the top left and moving clockwise are the adapters for the Super Nintendo, the original NES, the Sega Genesis and the Nintendo Game Boy.
The Game Genie for the original Nintendo Entertainment System was initially developed in 1990, but its release was delayed almost three years by this lawsuit. The device worked by intercepting the data sent by the game cartridge to the NES and altering it per the specifications of the selected cheat codes.
The Genie was not the only accessory produced for the NES, nor was it the only time Nintendo sued third-parties for copyright infringement.