You can link up 4 Gamecubes to each other as GBAs, or link four Gamecubes to another Gamecube or a Wii as GBAs, or any combination of Gamecubes and GBAs together or to a Wii or another Gamecube as GBAs. Also, the Game Boy Player and some Gamecube games let you use the Game Boy Advance as a...