For most of these cheats, you may need to Pause during a game before pressing the code combinations.
X, Up, Down, Triangle, Circle, Circle, Circle, L1.
Square, Down, Right, Circle, Square, Left, Up, X.
Up, Down, Right, Left, X, X, X, Triangle
Left, Right, Left, Right, L1, R1, L1, R1.
L1, Up, Left, Triangle, X, L2, R1, L2.