Cheat mode
Hold [L1] + [R1] + [R2] and press [Select] to enable cheat mode. The message "Cheats Enabled" will appear at the top of the screen to confirm correct code entry. The following codes may now be enabled.

God mode
Hold [L1] + [R1] + [R2] and press [Up], [Down], [Left], [Right].

Invincibility
Hold [L1] + [R1] and press [Up], [Down], [Left], [Right].

Unlimited weapons
Hold [L1] + [R1] and press [Up], [Down], [Up], [R2].

Powered-up weapons
Hold [L1] + [R1] + [R2] + [X] and press [Down].

Hornet Nest Stingers
Select stingers, then hold [L1] + [L2] + [R1] + [Triangle] + [Left].

Fire And Brimstone
Select Meteors, then press [Triangle] + [L1] + [L2] + [R1] + [Right].

Xagnar The Abductor's flying saucer vehicle
Enter [R1], [Square], [X], [Square], [L2], [Circle] as a password.

Goliath's Stillbirth vehicle
Enter [Triangle], [L1], [R1], [X], [L2], [L2] as a password.

Nightshade
Enter [R1], [R2], [L1], [L1], [X], [Circle] as a password.

Agent XQJ-37's helicopter
Enter [L1], [Triangle], [R2], [Triangle], [Triangle], [R1] as a password.

Play as Big Daddy
Enter [Triangle], [Square], [R2], [X], [Triangle], [R2] as a password. Choose challenge mode and select the "Nuke York" level. Big Daddy will appear on the vehicle selection screen. Note: When this code is enabled, prowlers can not be used and the game will not advance to the next level.

Double pick-ups
Enter [L1], [L2], [Circle], [L1], [R1], [Square] as a password.

Increased armor
Enter [R1], [Triangle], [R1], [Triangle], [L1], [Square] as a password.

Unlimited turbos
Enter [Square], [X], [Circle], [Triangle], [R1], [R2] as a password. Note: The special bar will still decrease, but turbos will still be available after it runs out.

Unlimited jumps
Enter [Circle], [Square], [R2], [X], [Triangle], [R2] as a password.

Funtopia level
Enter [X], [Circle], [L2], [X], [Square], [L1] as a password to enable the Funtopia level under challenge mode.

Gulch level
Enter [X], [Square], [Circle], [L1], [L2], [Square] as a password to enable the Gulch level under challenge mode. Alternately, enter [Square], [Square], [Triangle], [R1], [L1], [Circle] as a password.

Boss Battle 1
Enter [Circle], [R2], [R1], [Square], [L1], [R2] as a password. Note: Re-enter this password after every challenge battle. The first opponent will be a normal, random, character. Your opponent will transform into Goliath after the battle.

Boss Battle 2
Enter [Circle], [Circle], [L2], [L1], [Triangle], [Triangle] as a password.

Boss Battle with Big Daddy
Enter [Square], [Triangle], [Circle], [Circle], [R2], [R2] as a password.

Duke Nukem: Time To Kill FMV sequence
Enter [Square], [Square], [Circle], [Circle], [Triangle], [Triangle] as a password.

Change camera angle
Hold [Select] + [R1] and press [Down] during game play in single player mode for an helicopter chase view and overhead angle.

Change split screen
Hold [Select] + [R1] and press [Down] during game play in multi-player mode.

Full screen mode
Hold [Select] + [R1] and press [Up] during game play

Fast Alien saucer
Enable the "Alien Saucer" code . Go to any level and select the Alien Saucer. Rapidly press [Square] when the level finishes loading The Alien Saucer should speed up quickly, reaching over 300 mph. This can also allow you to exit the perimeter of the level. Note: The faster [Square] is pressed the faster the Alien Saucer will travel.

Automatic God mode
Use the "Lost in space" trick to blow up the Earth. Quit the game when prompted then start a new game, preferably from an existing save. God mode will automatically be activated.

Better RLB launching
Hold the fire button when firing your RLBs. The longer the button is held, the further they will launch. While the button is held, a revving up sound will be heard. The sound will stop when it has reached its full strength.

Flatten your own car
Enable the "Boss battle with Big Daddy" code. Ram into Big Daddy's feet and your car will be flattened.