Level Skip:
While playing, hold R1 and press Square, Square, Square, Circle. Release R1 then hold L1 and press Triangle, Triangle. Release L1 then hold R1 and press Square, Square.
Sword Upgrade:
While playing, press pause then hold L1 + R1 and press Circle, Square, Circle, Triangle, Triangle, Square, Circle, Square.
Big Heads:
While playing, hold R1 and press Triangle, Triangle, Triangle, Triangle. Release R1 then hold L1 and press Triangle, Triangle. Release L1 then hold R1 + L1 and press Triangle, Circle, Triangle.
