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. 

god              God mode
loaded           All weapons
fly              Flying mode
ghost            No clipping
walk             Deactivate no clip and flight
addbots          Add indicated number of bots   
open             Advance to indicated map
say              Broadcast message to others    
slomo <1.0-10.0> Change game speed (default is 1.0)       
Broadcast message to others say   
Change game speed (default is 1.0) slomo <1.0-10.0>  

allammo          Full ammo
killall          Kill all indicated enemy type    
killpawns        Kill all opponents   
behindview1      Third person view
behindview0      First person view
playersonly      Time stop
summon XX        Summon item XX. Replace XX with item names from the following list:

cannon 
eightball 
flakcannon 
nali 
skaarjwarrior 
quad shot 
warheadlauncher
enforcer 
doubleenforcer 
minigun2
pulsegun
shockrifle
sniperrifle
ut_biorifle
ut_eightball
ut_flackcannon
chainsaw 
rifle
razorjack
gesbiorifle 
minigun 
flakcannon 
dispersionpistol 
stinger 
automag 
asmd 
clip 
rifleround 
flakshellammo 
defaultammo 
Opponent names:

Use one of the following entries with the killall or summon codes. 

warlord
titan
stone titan
squid
slith
skaarj
skaarjwarrior
skaarjscout
skaarjlord
skaarjberserker
skaarjassassin
iceskaarj
skaarjtrooper
skaarjsniper
skaarjofficer
skaarjinfantry
skaarjgunner
queen
pupae
nali
nalipriest
mercenary
mercenaryelite
manta
giantmanta
cavemanta
krall
lesserkrall
krallelite
gasbag
giantgasbag
fly
devilfish
cow
babycow
tentacle
brute
lesserbrute
behemoth
bots
skaarjplayerbot
humanbot
malebot
maletwobot
malethreebot
maleonebot
femalebot
femaletwobot
femaleonebot
nalirabit
horsefly
blobelt
biterfish
bird1
parentblob
horseflyswarm
deadbodyswarm
biterfishschool



Hints

Continous Fire (any gun):
Pick a gun, any gun except the impact hammer. I.E.Double Enforcer. Push the trigger
and then Esc. Once you have done that release the trigger then press Esc again now
you should be able to shoot without pressing the trigger. And it wont stop untill you
press the trigger again or run out of ammo!