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. 

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

Combo moves
While playing a game, hold Triangle, and press one of the 
following button combinations to do the corresponding move:

Shield    -> Up, Right, Down, Left
Stun-> Right, Left, Up
Cash suck -> Left, Right, Up
Rear fire -> Right, Left, Down
Mine-> Left, Right, Down
Jump-> L1 + R1
Up on 2 wheels (Left)  -> Up, Down, Left
Up on 2 wheels (Right) -> Up, Down, Right