Hold L1+L1 and use the following codes during the gameplay to get the corresponding effect:
Invincibility: Circle, R2, Circle, Circle, Triangle, L2
All Powers: Circle, Circle, Trinagle, R2, L3, Triangle
Max Out Lives: L3, R2, R2, Circle, X, R3
Upgrade All Powers: L3, R3, L3, R2, Circle, R2
Global Items: R3, Circle, R2, R2, L3, Triangle
Max Our Arrowheads: X, R3, R3, R2, Triangle, Square