For each of the following codes, pause the game and hold down L1 and L2
together for at least 10 seconds. While still holding L1 and L2, enter each
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,
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,
Weapon Power Up--Down, Right, Down, Right, Triangle.