Things You'll Need
Instructions
Connect the round GameCube pug of an adapter, such as EMS' Classic Linker, to the GameCube controller port of your GameCube or Wii while the system is turned off.
Connect the Classic Controller's D-shaped plug into the front port of your adapter.
Turn your Wii or GameCube on, and insert a GameCube-compatible game disc into the console.
Press "Start" on the Classic Controller to control your GameCube game with the Classic Controller.