Boss Battle - Big Daddy
To battle Big Daddy enter the options screen and enter the password Square, Triangle, Circle, Circle, R2, R2.
Boss Battle 1
Enter the options screen and enter the password O, R2, R1, Square, L1, R2. Following every challenge you must reenter this code.
Boss Battle 2
Select the Password screen which is in the options menu and enter the password O, O, L2, L1, Triangle, Triangle.
Double Pickups
For a lot more power ups, enter the password screen and enter the password L1, L2, Circle, L1, R1, Square.
Duke Nukem: Time to Kill Movie
For a movie of Duke Numem: Time To Kill, go to options, choose Password, then enter the password Square, Square, Circle, Circle, Triangle, Triangle.
Enable Cheats
Hold L1 + R1 + R2 + Select when you begin the level.
Extra Armor
Select the options screen, select Password, then enter R1, Triangle, R1, Triangle, L1, Square.
Funtopia Level
To open the Funtopia level, select the option menu and select Password, then enter X, O, L2, X, Square, L1.
God Mode
Access the "enable codes" cheat then press and hold L1, R1, R2, then press up, down, left, right.
Gulch Level
Select the options menu go to the password screen and enter X,square,O,L1,L2,square.
Hornets Nest:
After accessing the "Enable Cheats" code select the stinger weapon and hold Triangle + L2 + L1 + R1 + Left.
Infinite Jump
Select the options screen, then select Password, then enter Circle, Square, R2, X, Triangle, R2.
Infinite Turbo Boosts
Select the options screen, then select Password, and enter Square, X, O, Triangle, R1, R2.
Invincibility
After accessing the "Enable Cheats" code press and hold L1 + R1, then press Up, Down, Left, Right.
Play as Big Daddy
Inside the options screen go into the password screen and enter Triangle, Square, R2, X, Triangle, R2. Big Daddy can only be used in one-player challenge mode.
Play as Goliath
Select the options menu, select Password, then enter Triangle, L1, R1, X, L2, L2. Goliath is the steam roller who you see in Area 51.
Play as Nightshade
select the options menu, select Password, then enter R1 R2 L1 L1 X O.
Play as a Helicopter
Select the options menu, select Password, then enter L1, Triangle, R2, Triangle, Triangle, R1.
Play as an Alien
Select the options menu, go to Password, then enter R1, Square, X, Square, L2, O.
Unlimited Weapons
While battling press and hold L1+R1+R2 then press
Up, Down, Left, Right.