Press [Enter] during game play to display thecommunication window. Then, enter one of the following codes toactivate the corresponding cheat function.

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 teamin 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.

Throw a flashbang grenade into a room before you enter. The stun effect might give you enough time to get the drop on the room's occupants.

Use any break in the action to change magazines. There is never a good time to run out of bullets.

Properly equip your team members. Do not rely on the "Equip All" button once you have a good general-purpose kit. Doing so will not put a sniper rifle in your sniper's hands or a breaching ring where needed.