Press [Esc] during game play, then type one of the following codes to activate the corresponding cheat function.
Effect
Code
Press [F1] to [F6] for weapon selection
13579
Press [F11] for +1,000 experience
10203
Press [F9] for full health
19283
Powerful weapons
Use a text editor such as notepad to edit the "weapons" file in the game directory. Change the values of the "burst", "explosive", "speed", and other stats as desired.