Psychonauts (PS2)

God Mode:
Press Circle, R2, Circle, Circle, Triangle, L2.

9999 Lives:
Press L3, R2, R2, Circle, X, R3.

9999 Arrowheads:
Press X, R3, R3, R2, Triangle, Square.

All Powers:
Press Circle, Circle, Trinagle, R2, L3, Triangle.

All Powers Upgraded:
Press L3, R3, L3, R2, Circle, R2.

Global Items:
Press R3, Circle, R2, R2, L3, Triangle.