99 Explosive Bullets
     Pause gameplay and press R2, Down, L2, Up, Right, Down, Right, Left.

Debug Mode
     Pause gameplay, hold L1 and press Down, Down, Triangle.

Invincibility
     Pause  gameplay  and  press  Up,  Up,  Up,  Up, Up, Up, Triangle,
Triangle, Circle, X, X, X, Square, Down, Up, Right, Left.

Play as a Monkey
     During   gameplay,  press  Triangle,  Triangle,  Circle,  Circle,
Circle, Circle, Circle.