Start at the main menu, then select game, then option, then bonus. Hold
down L1 and R1 and then enter the following code: down, circle, up, square,
down, down, up, up (let go of the shoulder buttons when you are done).
Then from the main menu, select the cheat option and enter the following codes.
Unlock All Levels
One Hit Kills
999 Rounds of Ammo
KK 999 mun