Start the game with the command-line parameter 'cheats 1'. Then during gameplay, enter any of the following "Codes" in the console: Code Effect 

god   God Mode 

noclip   No Clipping 

give all   All Weapons and Ammo 

give (item_name)   Spanw (item_name) 

notarget   Disable Enemy AI 

cmdlist   List Console Commands 

map (level_name)   Skip to (level_name) 

raven 1   Level Select at Main Menu


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Load the game with the sof.exe +set console 1 command line. While playing, press ~ to display the console and type cheats 1 for cheat mode. You may now enter any of the codes listed below: 
God mode --- heretic 
Invisible to enemies --- ninja 
First six weapons with full ammo --- elbow 
Last six weapons with full ammo --- bigelbow 
No clipping mode --- phantom 
Slow-mo mode --- matrix (1-10) 
Spawn any object --- gimme (give item name)