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Special Power Up

Enter gameplay and pause the game. Go into the options menu and highlight sound FX volume. Press O, O, O, O, square, X, select, square, X, select, O. Go to quit and enter yes, The screen should flip for correct code entry.

Heavy Power Up

Enter game play and puse the game. Go to the options menu and highlight sound FX volume. Press square, square, square, O, X, O, X. Go to quit and press yes. The screen should flip for correct code entry.

Unlimited Machine Power Up

Enter gameplay and pause the game. Enter the options menu and highlight sound FX volume. Press O, O, O, X, X, X, O, select. Go to quit and select yes. The screen should flip for correct code entry.

Invincibility and Unlimited Ammo

Enter gameplay and pause the game. Push select to go into the options menu and highlight sound FX volume. Press O, O, select, select, O, select, X, square. Then go to quit and say yes. The screen should flip for correct code entry. Your weapons should be blinking when you re-enter gameplay.

Easter Egg Weapons

Enter these codes on the password screen.

DYPYFASRHR -- All missions completed, all easter egg weapons.
SYMRGOBRRL -- No missions completed, all easter egg weapons.
DYSIFASRHY -- All missions completed and locked, all easter egg weapons.

Robo Dog Weapon

On the 4th level go through the first gate. Turn left and destroy any enemies that get in your way.Go straight, then in the first alley, turn left and go straight all the way to the end. Once you reach the limit of the screen, turn right and go all the way down to the water and there's your Robo Dog heavy weapon.

Riot Shield Technology

In the Studio City level destroy the four control towers at the start of the level.(You have to do this to proceed anyway.) Now in the north west corner of the subway area, a laser fence should diactivate. Behind it is a switch that can be activated. Continue on with the level. Just past the giant mushroom area, you should encounter a large green mutant(your briefer will call it a bodygaurd.) Destroy the sign that reads "Mutant Soccer Champ" behind the bodygaurd. Backtrack to the mushroom area. As you enter, take a right turn onto a gray cliff. Proceed along this cliff. You should find a reloader with a shield symbol with a lightining bolt on it. This is the riot shield.

Grenade Technology

In the Zuma Beach Level, follow the road you begin on to the first crowd control area. Here you must destroy two pink flamingoes atop two different buildings. Continue the level until you reach the mini boss. Destroy the mini boss and drop into the hole it creates. In the area below, find a inactive tank that can be hurt. Destroy it to reveal the grenade tech.

All missions completed & locked, bonus weapons, invincibility

Enter "DYTIFASUHL" as a password in the Crime War or Precinct Assault screen.