Press T during game play to display the chat window. Enter one of the following codes then press [Enter] to activate the corresponding cheat function.

Effect- Code
All weapons sub-routines, full health, full energy - mpkfa
Unlimited ammunition and all weapon sub-routines - mptears
Full health - mphealth
God mode - mpgod
Level skip - mpmaphole
Full ammunition for weapon sub-routines - mpammo