Press ` to bring up the console. Type iamtheone and press Enter to enable cheat mode. Now type in the following codes and press Enter to activate. NOTE: These only work in single player.
allammo Full ammo
behindview1 Third person view
behindview0 First person view
god God mode
loaded All weapons
fly Flying mode
ghost No clipping
playersonly Time stop
summon XX Summon item XX. Replace XX with item names from the following list:
walk Deactivate no clip and flight
asmd
automag
cannon
chainsaw
eightball
enforcer
flakcannon
minigun2
nali
pulsegun
quad shot
razorjack
riflecannon
shockrifle
sniperrifle
stinger
warheadlauncher
