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Enable the console from the game's in-game options. At the main menu, hit the tilde key (~) to drop the dev-console. Type seta thereisacow "1337" and then press ENTER. Type spdevmap and then press ENTER. You will receive an error. This is normal. You can now start or resume a game. When playing, drop down the dev-console (~) and enter the following codes and hit ENTER to activate or toggle them.
Code: Result:
give all Access All Weapons
god God Mode
noclip No Clipping Mode
notarget Enemies Ignore You
give ammo Full Ammo
jump_height # Adjust Gravity (Default = 39)
timescale # Adjust Time (Default = 1.00)
cg_LaserForceOn 1 Add Laser Sight to All Weapons
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Enable the console from the game's in-game options. At the main menu, hit the tilde key (~) to drop the dev-console. Type seta ...