Choose the "Game Settings" selection at the options menu. Then, press Left, Right, L1, L2, R1, R2, Square, Circle. Note: You may have to highlight the "Difficulty" option. A sound will confirm correct code entry. A "Cheats" option will now be unlocked at the settings screen. Enable cheat mode to load or start a new game and begin with 999 ammo, all weapons, and all combos. Alternately, successfully complete the game and save when prompted to unlock the "Cheats" option.
Recharge:
After unlocking cheat mode, turn it on. Start a game and press X(3),Square(3)
instead of using med kits and both of your energy bars will recharge.