Misc. Codes:
Enter the following at the Cheat Screen:

L1, L2, R2, R1, L1, L2, R2, R1, L1, L2, R2, R1, L1, L2, R2, R1, Circle, Circle, Circle, Circle, X, X, X, X, Square, Square, Square, Square, Select, Select, Select, Select - Master Code

X, X, R1, X, L1, X - Big Headed Enemies

L2, R1, L1, R2, Circle, X, Square - First Person Mode

R2, X, L1, Square, R1, Circle, L2 - All Weapons

Square, Square, X, Circle, Circle, X, Square - Big Head Mode

Square, Square, Square, Circle, Circle, Circle, X - Double Damage Mode

Square, X, Circle, Circle, X, Square, Square - Small Head Duke

L1, L1, R1, R1, X, X, Circle, Circle - Full Armor

R1, R1, Circle, Circle, L1, L1, R2 - Full Ego

L1, Square, Circle, Circle, Square, L1, L2 - Invincibility

Circle, X, Square, Square, X, Square, Circle - Level Select

L1, L2, R1, R2, Square, Square, Circle, Circle - Out-Takes Movie

X, L1, X, R1, X, X - Small Head Enemy Mode

L2, Circle, R2, Square, Circle, L2, R1 - Unlimited Ammo

Circle, R2, L1, Square, L2, X, R2 - View the Ending Movie

Alternate shower girl cutscene:
On the ''space bay'' level, when you reach the area with the naked girls taking a shower, do not rescue them with the stealth generator yet. Instead, pass them up and rescue the babes in the prison cells. Now go back and rescue all of the babes in the shower using the stealth generator.Now,instead of seeing the regular cutscene, you should now see the *sexier* alternate 'shower girl' cutscene.