By 
Activate the console in the game options menu, then hit the ~ (tilde) key to bring up the console. Type seta thereisacow “1337” and press “ENTER”. Type “spdevmap bot_a” and again press “ENTER”. Use any of the cheats below:
give all Access All Weapons
cg_LaserForceOn 1 Add Laser Sights to ALL Weapons
jump_height # Adjust Gravity Default = 39
timescale # Adjust Time Default = 1.00
sf_use_ignoreammo 1 Allows you to shoot without reloading.
r_fullbright Easier to see things
notarget Enemies Ignore You
give ammo Full Ammo
god God Mode
demigod God mode but screen still shakes
kill Kill player
noclip No Clipping Mode
take all Removes all your guns and health
take ammo Removes your ammo
cg_drawGun Removes Your Gun
ufo Same as noclip?
player_sprintSpeedScale Set player’s sprint speed
cg_laserlight 1 To draw the light emitted from the laser
cg_fov Zoom with any Gun
