TechLookz

Quick tips in battle:
Quickly press [A] to reload your weapon.
Quickly press [b] to switch to your alternate weapon(s).
Quickly press [Y] to lean up against a wall or some sort of cover in third person view.

If you are running and are suddenly fired upon, click the [Left Analog-stick] to lie flat.

Click [Right Analog-stick] to zoom in with a sniper or rifle. This will not work with large automatic machine guns.

Slip and slide:
When you are running and suddenly get fired upon, quickly tap the [Left Analog-stick]. You will slide along the ground. If you are running and click and hold the [Left Analog-stick], you will do a sort of belly flop and slide on your stomach.

Cheat mode:
Press start during the game and while on the pause menu hold the Left Trigger and Right trigger and enter the password:

Code - Result:

LB, LB, RB, X, RB, Y - Put your life at 100%
RB, RB, LB, X, LB, Y - Unlimited Ammo
X, X, Y, RB, Y, LB - Team Invincible
Y, Y, X, RB, X, LB - Scott Mitchell Invincible
Y, RB, Y, RB, X - All Levels

Sluggish controls:
If you are carrying a large automatic weapon, the controls will feel sluggish because of the weight of the gun. However, if you switch to a hand held gun, the controls will be more responsive.

Xbox Live music help:
Keeping the music on is recommended, as the tempo picks up when you are approaching the enemy. Conversely the music slows back down when you are at a safe distance.

GRAW: Fly:
Go by the last seen spot of the V.I.P. Dive out in front of the car and switch to assault. Call the team to regroup and go forward while lying down. You will fly a few inches above the ground.

Walls and barriers:
You cannot hide behind walls or barriers in first person view unless you plan on staying at that location for awhile. Unlike third person view where you can just tap Y to automatically hide, you must hold [Y] in first person view to hide. Press [Up] to look over a barrier or to open fire. Press [left] or [right] (depending on how you are positioned) to look out.