Have a saved game file from The Mark Of Kri on your memory card to begin the game with six alternate costumes already unlocked.
Enter the following codes at the "Press Start" or title screen. If you entered the code correctly, you will hear a sound. Enter the "Extras" menu and select the "Cheats " option, then press X to activate the unlocked cheat.
At the "Press Start" screen, press Square, Circle, X, Square, Circle, Square, X, Circle, X, Square, Circle, X.
At the "Press Start" screen, press X (4), Square (4), Circle (4). Health power-ups will all be 100%.
At the "Press Start" screen, press X, Circle, Square (2), X, Square, Circle (2), X, Square (2), X.
At the "Press Start" screen, press X, Circle, Square (2), X, Square, Circle (2), X, Circle (2), X.
At the "Press Start" screen, press X, Circle (2), Square, X, Square (2), Circle.
At the "Press Start" screen, press X, Circle (3), X, Square (3), X, Circle, Square, X.