Level select
 
 At the main menu, hold Select and quickly press Triangle(3). Then,
 press Square, X, Square, Triangle, X, Triangle, Circle, Square. Begin
 a new game, then hold Select and press Left or Right at the mission
 introduction screen to choose a new starting level.
 
 Invincibility
 
 At the main menu, hold Select and quickly press Triangle(3). Then,
 press Triangle, Circle(2), Triangle, Circle, Square, X(2).
 
 Super gun
 
 At the main menu, hold Select and quickly press Triangle(3). Then,
 press X, Circle, Triangle, X(2), Circle, X, Square.
 
 Invisibility
 
 At the main menu, hold Select and quickly press Triangle(3). Then,
 press Square, Triangle, X, Square, Triangle, Circle, X, Triangle.
 
 Overhead view
 
 At the main menu, hold Select and quickly press Triangle(3). Then,
 press Triangle(2), X(2), Square, Circle, Square, X.