Press TAB during game play to display the console window and pause the game. Activate the following cheats by entering the corresponding codes and pressing ENTER. Press TAB to resume game play:

CHEAT FUNCTION - CHEAT CODE
Maximum ammo for player - ammo
Bind key to action - bind <key> <action>
Toggle crosshairs - crosshairs <0 or 1>
Position debug information - debug on
Frame rate information - debug plus
Remove debug display - debug off
Quit game - exit
Toggle polygon fill - fill <0 or 1>
Set gamma level; 0 is darkest - gamma <0-20>
Toggle God mode - god <0 or 1>
Set player's health to maximum - health
Toggle GL lighting - light <0 or 1>
Toggle lighting map debug mode - lmdebug <0 or 1>
Load indicated level1 - map <level name>
Toggle mouse control - mouse <0 or 1>
Set skill level; 0 is easiest - skill <0-2>
Toggle enemy's sight - target <0 or 1>
Remove key binding - unbind <key>
Toggle volumetric fog debug mode - vfdebug <0 or 1>

1. Use the filename without the .DAT extension as the level name.