Enable the console at the options menu. Then, press ~ to display the console window. Type seta thereisacow "1337" and press [Enter]. Then while playing the game, press ~ to display the console window, and type one of the following codes and press [Enter] to activate the corresponding cheat function. Note: Open the cfg file with a text editor and change the "seta monkeytoy" value from "1" to "0" if needed.

Result
Cheat Code


God mode
god


God mode but screen still shakes
demigod


No clipping mode
noclip


Flight mode
ufo


All weapons
give all


Full ammunition
give ammo


Add laser sight to all weapons
cg_LaserForceOn 1


Enemies ignore you
notarget


Change maps
map or spdevmap [name]


Spawn indicated item
give [item name]


Set gravity; default is "39"
jump_height [number]


Set speed; default is "1.00"
timescale [number]


Remove gun graphics
cg_drawGun


Zoom with any gun
cg_fov


Better vision
r_fullbrigh

In the "All Ghillied Up" mission, you will come across a wild dog eating a dead soldier’s remains. You will be told to leave it alone, but if you want a very difficult challenge in the game, shoot it. You will be attacked by a large pack of angry dogs.