All Items...
	All Keys...
	All Weapons...
	Beat the Game...
	Big Head Duke...
	Big Head Opponents...
	Double Damage...
	Infinite Ammo...
	Invincibility...
	Invisibility...
	Invulnerability...
	Level Select...
	Select Powered-Up Weapons...
	Small Head Duke...
	Small Head Opponents...
	Temporary Invincibility...
	View Scenes...

Press R1(5), L2(5).

Press Up, Right, Up, Left, Down, Up, Right, Left, Right, Down.

Press L1, L2, Up, L1, L2, Down, R1, Right, R2, Left.

While playing hold L2 + R2 then press Square, Triangle, Circle, Circle, Start.

Press R1(9), Up

Press R1(9), Left

Press L2, R2, L2, R2, L2, R2, L2, R2, L2, R2.

Press [Left, Right, Left, Right, Select] twice.

Press L2, R1, L1, R2, Up, Down, Up, Down, Select(2).

Press L1, R1, L1, R1, L1, R1, L1, R1, L1, R1.

Enter one of the following codes while the game is paused:
First pause the game and press: L2, R1, L1, R2, UP, DOWN, UP, DOWN, SELECT, SELECT. And it should say Invulnerability.

Press Down(9), Up {See Note Below} Note: After entering this code, exit the game. Then at the bottom of the main menu there will be a new option called "Time To Kill". Select this new option, then press Left or Right to choose a level and press X to go to the level.

Press Right(2), Left, Right(2), Left, Right(2), Left.

Press R1(9), Down.

Press R1(9), Right

Press R1, L2, L1, L2, R1, L1, R1, L2, L1, L2.

Intro Scene: Pause game, press select, up nine times, select, L1.
Victory Scene: Pause game, Select, up nine times, select, L2.
View Credits: Pause game, Select, up nine times, select, R1.
Make Duke Wear A Kilt:Pause game, Select, up nine times, select, R2