God mode:
Press Up(2), Down(2), Left, Right, Left, Right, B, A during game play. The 
message "God Mode" will appear to confirm correct code entry. Note: This only 
seems to effect you, and not your team or hostages.

Laser trails:
Press Up, Down, Up, Down, click Right Analog-stick(2) during game play. Rainbow 
weapons will shoot red laser trails and opposing force weapons will shoot blue 
laser trails. 

Credits level:
Click Left Analog-stick(2), click Right Analog-stick(2), press X, Y, B, A, B, A at the 
main menu. 

Old City And Import-Export On Team DM 
When playing online, it is possible to play Old City and Import/Export during Team 
Survival. 

Go to the main menu screen
Select Create Match
Go to GAME TYPE and select Mission
Then hit Next

Highlight Old City or Import-Export and back out by hitting B.

Now push up and accept the choice. You should now be on the screen where you 
can change your GAME TYPE. Go to GAME TYPE and select Team Survival. Scroll 
down and change the number of players to what you want. Click on NEXT at the 
bottom of the page. Highlight the same map you picked before (Old City or 
Import/Export) and select it. 

WARNING - When you start the match, everybody will be inside each other 
because everyone spawns int the exact same place. Before you start the match, 
decide which team goes first and give them at least a 20-30 second head start, 
and after the match, the other team gets the head start. 

Oil refinery:
On the first level that you are in an oil refinery, take an HE grenade launcher as 
your secondary weapon. At the end when the enemies fire RPGs, take it out. Step 
out from under the roof area so that enemy fires an RPG. Three enemies will 
appear. Shoot an HE round to kill them. Move back under the roof, reload you HE 
Grenade launcher, and wait until a second RPG is fired. Move around the corner 
and with your HE grenade launcher and shoot the man that is standing there. Turn 
around, and when the garage door opens, shoot the barrels on the right side with 
your primary weapon. Kill all enemies, secure the hostage, and the level will be 
completed. Note: It recommended that you save the game when you open the 
door that leads to the RPG area.

Penthouse: Easier kills:
Even though you are told "no shooting" in this level, there is a surprise later where 
you have to shoot to first save someone then escape. Because of this, change 
your secondary weapon to either the Desert Eagle or SR-2. This way you will not 
have to shoot someone four times to kill him with a weak silenced pistol.

Conserving ammunition:
After every fire fight, reload even if you have 22 rounds remaining. If you keep 
doing this, you should have enough ammunition for the long fire fights and levels.

Gun guide:
If you are going into a total building level such as the Crespo Foundation, take 
along a shotgun or a submachine gun. The reticule does not shrink as much when 
you move with an assault rifle. You will move around a lot in buildings and room 
clearing. For places like an oil refinery, which has big indoor rooms and some 
outdoor areas, take an assault rifle that is compact to carry a punch but is still 
semi-maneuverable in rooms. In industrial indoor settings, take a sub that is good 
for big rooms and is still effective for small rooms. In total building settings, take 
along a shotgun. Its targeting reticule barely shrinks when you move.

Invincibility 
While playing, press UP, UP, DOWN, DOWN, LEFT, RIGHT, LEFT, RIGHT, B, A. You 
will be invincible. Enter this code again to deactivate the cheat. 

Hint: Cheap Spot In Carnival 
On the big ledge by the green spawn, if you get really close to the edge, crouch, 
and slowly walk off the edge. It takes some time to master, but when done 
correctly you can walk on a ledge about halfway up the big balcony and pick off 
anyone that comes around. 

Clearing rooms:
To clear out a room, stand besides the door, as one of your teammates would 
have if you told him to clear out a room. Make sure that your clip is full and the 
action icon does not have the brackets around it, so your teammates will not open 
it for you and take fire. Finally, make sure that all of your teammates are stacked 
up properly: 

(for double doors)   _____       (for single doors) ___
               *     *  *                          *  *
                     *                             *  *

Then, rush the room with thermal/night vision (your choice) on and scan left to 
right for enemies. Then, strafe to the left of the door to let your teammates in. 
Next, walk around the perimeter of the room and when your teammates say threat 
neutralized (on some smaller rooms they do not say anything), your work is done. 

Hint: Garage: Capturing Emilio Vargas: 
In order to capture Vargas you need to move fast. This will cause you to take 
some damage, but to take out enemies quickly use the HE grenade launcher or the 
Red Phosphorus grenade launcher. Use it on groups of enemies as you are chasing 
after him. This works best on the two guards in the cafeteria style room; if you 
have not caught him yet, you can shoot the grenade off the wall and take both out 
without stopping.

Hint: Meat Packing Plant: Finding hidden enemies:
After you rescue the second hostage, you have to go into a giant freezer. Take out 
the guards on the cat-walk then get into the crouching position. Turn on your 
thermal imaging goggles. There will be guards, but they will be blacked out by mist 
and the carcasses of dead cows. However, with the goggles you can see their feet. 
Shooting them in the feet or legs enough times will kill them, saving you and your 
men from exposure.

Get on top of the Trains in Trainyard :
You need two people. Go to the back train yard by the computer room. There 
should two black dots on the wall behind the trains face those dots and crouch. 
Have the other guy go top off flatbed train car looking down at the other guy. Run 
right off his head on to the train. Also once on the train turns left and walk slowly 
to the corner of the rain and the ledge and you can float back and forth. 

Get out of Penthouse map 
This glitch let's you get out of the Penthouse map in Terrorist Hunt. You need at 
least two people. Go to the room with the big screen TV with the soccer game 
playing. In that room there are five or six steps. Have one person get about 
midway up the steps. The other person should shoot the glass out of the balconies 
and run straight onto the head of the guy on the stairs and out of the window. 
From there you can move freely outside the map and can get a few free kills. 

Alternate voice commands:

Covering
"Need backup"

"Cover me" 
Defusing bombs

"Defuse bomb"
"Demo up"
"Defuse"
"Bingo" 

Securing hostages
"Secure the hostage"
"Secure"
"Cuff him" 

Abort previous command 
"Abort!"