Level select
 
 Play through the game normally until completing Subway A1. Return 
 to the main menu and press Up, Down, Left, Right, Up, Left, Down, 
 Circle.
 
 
 
 Invincibility
 
 Pause the game and press L1(2), L2(2), R1(2), R2(2). Note: This 
 code may need to be re-enabled after an auto-save.  
 
 
 All weapons and full ammunition
 
 Pause the game and press L1, L2, R1, R2, Triangle, Circle, X, Square. 
  
 
 
 Infinite ammunition
 
 Pause the game and press L1, L2, R1, R2, Triangle, Square, X, Circle.
 
 
 
 
 Infinite bullet time
 
 Pause the game and press L1, L2, R1, R2, Triangle, X(2), Triangle. 
 Repeat this code to disable its effect.
 
 
 
 8 Pain Killer Pills
 
 Pause the game and press L1, L2, R2, R1, Triangle, Circle, X, Square. 
 Note: This also unlocks all weapons and full ammunition.
 
 
 
 
 Slow motion sounds
 
 Pause the game and press L1, L2, R1, R2, Triangle, Square, X, Circle.
 
 
 
 
 Additional difficulty settings
 
 Successfully complete the game on the "Fugitive" difficulty setting 
 to unlock the "Dead On Arrival" and "The New York Minute" difficulty 
 settings.
 
 
 
 Last Challenge bonus level
 
 Successfully complete the game on the "Dead On Arrival" difficulty 
 setting.
 
 
 
 Secret programmer room
 
 Successfully complete the Last Challenge bonus level. The doors 
 in the back of the room will open up to the Remedy Room.