Unverified.
God Mode .... Hold BACK then press GREEN, BLUE, YELLOW, RED.
Refill Ammo ... Hold Back then press GREEN, RED, YELLOW, BLUE.

Submitted by virpyre79 (TXB)

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.

Turn off the automatic aim option to get a good head shot. Otherwise, you will lock on to the enemy's body.

Click the left analog stick in and move the stick LEFT or RIGHT to peek around corners. You cannot shoot while doing this.

Beat the single player Campaign mode to unlock the original Wolfenstein 3D.