Psychonauts trainer - use the following keys to enable the desired effect:
F1: infinite health
F2: infinite PsiBlast ammo
F3: infinite PsiShield
F4: infinite invisibility
F5: all powers
F6: all items
F7: 9999 lives
F8: max rank
F9: 9999 arrowheads
F10: 9999 PsiBlast ammo
F11: multiple jumping
F12: in-Game menu