Airstrike in multi-player mode:
A lieutenant can call in an airstrike by pressing Zoom, then pulling the trigger on where you want the bombs to drop. There is a ten second delay.
Head shots:
Turn off the automatic aim option to get a good head shot. Otherwise, you will lock on to the enemy's body.
Peeking around corners:
Click and hold the Left Analog-stick while moving it left or right. The only problem is that you cannot shoot.
Wolfenstein 3D:
Successfully complete single player campaign mode to unlock the original Wolfenstein 3D.
