Hold R + G + K + O then enter one of the following codes to activate the corresponding cheat function. Note: The codes will not function if a joystick is present.

Effect	Code
Access card for next level	[Ctrl] + 5
All weapons	[Ctrl] + 2
Full map	[Ctrl] + 1
No damage	[Ctrl] + 4
Unlimited ammunition	[Ctrl] + 3