Things You'll Need
Instructions
Navigate to a PS2 codes website (see Resources). Locate the game you wish to code. Note the "Master Code" for the game.
Turn off the PS2 and insert the PS2 memory card into the memory card slot. Place the Action Replay disc into the PS2's disc drive. Turn the PS2 on. The Action Replay main menu will display on the screen.
Locate "Expert Mode" on the Action Replay main menu. Press "X" on the PS2 controller to select it. Navigate through the list of games displayed and choose the game you wish to code. Press "X" to select it.
Enter the "Master Code" from one of the code websites you visited and paste it into the text box of the game you selected. Select "New Code" and press "X" on the PS2 controller.
Type in the name of the code when prompted within the Action Replay Max main menu. Enter something that describes the function of the code. Press "Start" on the PS2 controller and select "Start With Codes" from the main menu displayed. Eject the Action Replay disc and replace it with the PS2 game you just coded. The game will now play with the new function you added to it through the code you entered.