OH DEAR: type this at the main screen to enable cheat mode. ALT-1: grants full ammo. ALT-2: grants a weapon upgrade. ALT-3: boosts energy. ALT-4: toggles god mode. ALT-5: ? ALT-6: ends the current mission. ALT-7: deactivates enemies. ALT-8: switches to helicopter mode. ALT-9: switches to tank mode. ALT-0: increases speed.