Passwords:

Play as Alien saucer - Enter R1, Square, X, Square,
L2, Circle 

Play as Goliath - Triangle, L1, R1, X, L2, L2 

Play as Nightshade - R1, R2, L1, L1, X, Circle 

Play as Helicopter - L1, Triangle, R2, Triangle, 
Triangle, R1 

Funtopia level - X, Circle, L2, X, Square, L1 

Gulch level - X, Square, Circle, L1, L2, Square or
Square, Square, Triangle, R1, L1, Circle
 
Boss Battle 1: - Circle, R2, R1, Square, L1, R2 as
a password. Note: Re-enter this password after 
every challenge battle. Your first opponent will be
a normal, random, character then your opponent will
transform into Goliath after the battle. 

Boss Battle 2 - Circle, Circle, L2, L1, Triangle, 
Triangle 

Boss Battle with Big Daddy - Square, Triangle, 
Circle, Circle, R2, R2 

Double pick-ups - L1, L2, Circle, L1, R1, Square 

Increased armor - R1, Triangle, R1, Triangle, L1, 
Square 

Infinite turbos - Square, X, Circle, Triangle, R1,
R2.  
    
Infinite jump - Circle, Square, R2, X, Triangle, R2