Extra life
Enter Triangle, Circle, Star, Square, Square, X 
as a password at the vault screen. 

Ten Lives
Enter Square, X, Circle, Circle, Triangle, Square 
as a password at the vault screen. 

Invincibility
Enter Square, Star, Triangle, Square, Triangle, 
Diamond as a password at the vault screen. 

Invincibility during play
Pause game play, then hold L2 and press Down, 
Up, Left(2), Triangle, Right, Down. 

Gex quotes
Pause game play, then hold L2 and press Down, Right, 
Left, Circle, Up, Right. Resume game play and press 
Select to force Gex to make a comment. 

Play as Alfred
Enter Square, X, Triangle, Square, Star, Star as 
a password at the vault screen. 

Play as Cuz
Enter Square, Diamond, Square, Square, Triangle, 
Diamond as a password at the vault screen. 

Play as Rex
Enter Square, Star, Star, Square, Triangle, Triangle 
as a password at the vault screen. 

View FMV sequence
Enter Circle, Triangle, Square, Star, Diamond, Star 
as a password at the vault screen. 

View FMV sequence 2
Enter Diamond, Star, Square, X, Triangle, Circle as 
a password at the vault screen.