Cheatcodes
Press 'Enter' during game play then type in the following cheats:

avatargod - God mode
teamgod - Team God Mode
explore - Turn off victory mode
5fingerdiscount - Restores your ammo
nobrainer - Turns of AI
turnpunchkick - Players 2d
meganoggin - Bighead mode
bignoggin - All players have a big head
clodhopper - Big feet and hands
stumpy - Stumpy mode
1-900 - Heavy Breathing
theshadowknows - Invisible mode
teamshadow - Team invisible mode
debugkeys - Enable Debug mode...
silentbutdeadly - Fart mode kills all
fastactionresponseteam - Fart but no kills
monocle - Monocle mode
1-900 - Heavy breathing
stumpy - Stumpy Mode
normalcolors - Map draw AI normal colors
panickedcolors - Map draw AI panicked colors
roestatecolors - Map draw AI ROE colors
roespeedcolors - Map draw AI ROE speed colors
combatstatecolors - Map draw AI combat state colors
behaviorcolors - Map draw AI behavior colors
psychstatecolors - Map draw AI psychological state colors
threatawarenesscolors - Map draw AI threat awareness colors
awarenessstatecolors - Map draw AI aware colors
alertnessstatecolors - Map draw AI alertness colors
aiplancolors - Map draw AI plan colors
levelmaps - Map draw level maps
testplan - Map draw test plan
drawplan - Map draw plan
pathpointlinks - Map draw path point links
coverpoints - Map draw cover points
pathpoints - Map draw path points
objectwalls - Map draw object walls
obstaclewalls - Map draw obstacle walls

Docks level: Sniper spot:
The following trick works especially well in multi-player mode. Equip yourself with a nice sniper gun (for example, Dragonuv, PSG, Walther 2000, etc.) If in multi-player mode, put your team in the "Chop Shop". There should be two or three doors. Go through the one that is well-lit and is glowing a yellowish color. When you walk out, you will see three trailers to your left. There should be a fence directly ahead of you with an opening on the right side. When you walk up to it, you will notice it is the end of the map and you cannot go through it. However, keep clicking forward and keep hitting run off and on again, to eventually get through. Go back as far as you can and take your sniper gun. You can now see almost the entire stage by strafing left and right, but enemies cannot see you. It is a good idea to have someone on your team acting as your cover. Have them be the bait and cover you until you get in.