For each of the following codes to work, pause the game and then hold down L1 and L2 for at least 10 seconds. While still holding L1 and L2 down, enter each code.
Extra Ammo / Down, Right, Circle, Left, Right, Circle.
Extra Lives / Left, Down, Right, Triangle, Square, X, Circle.
Extra Bombs / R1, R2, X, Triangle, Square, Circle, R1, R2, Circle, Circle, Square.
Health / Right, Right, Left, Down, Down, Up, Triangle, Circle.
Level Select / Up, Right, Down, Left, Triangle, Circle, X, Square, X, Triangle, Square, Circle.
Level Skip / X, R1, Triangle, R1, Square, Circle, R2, R2, X, Square, Triangle, X.
Weapon Power Up / Down, Right, Down, Right, Triangle.