Originally Posted by Wiikipedia
The Wii console is backward compatible with all Nintendo GameCube software and most GameCube peripherals. This backwards compatibility is achieved with the help of the slot-loading drive being able to accept GameCube discs, and a set of four GameCube controller ports and two Memory Card slots, concealed by flip-open panels.[1] A GameCube controller is required to play GameCube games, as neither the Wii Remote nor the Classic Controller functions in this capacity. A GameCube memory card is also necessary if you want to save, as the Wii internal flash memory will not save GameCube games. Nintendo has stated that the Wii console is not compatible with the GameCube modem adapter, broadband adapter, Game Boy Player, AV cable, or AC adaptor.
