Things You'll Need
Instructions
Select a Code for an Existing Game
Insert the Action Replay disc into your GameCube. Plug the Action Replay memory card into the second memory card slot on the GameCube and power up the system.
Using the controller, select "Action Replay Codes" from the main menu. Select the game region for which you want to see codes.
Select a game from the list that appears. Press "A" to toggle a specific code on or off. When you are done, press the Start button.
Remove the Action Replay disc when prompted, and insert your game disc to begin playing the game with the cheats enabled.
Entering a New Code
Launch the Action Replay software as described in Step 1 above.
Select "Action Replay Codes" from the menu and then select the appropriate region.
Select "Add New Game" from the Game Select screen to add a new title. Enter the title of the new game using the controller and the on-screen keyboard and select "Done" when finished.
Select the title for which you wish to add new codes. Select "Add New Code" and enter a description of the code followed by the code itself using the on-screen keyboard. Choose "Done" to save the code.