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XBox - Gunmetal cheats

Choose any mission:
Click Left Thumb-stick, push Black, R, click Right Thumb-stick, push White, L 
buttons on your controller while you are at the mission selection screen.

Funny mission briefing:
Play missions 1, 3, 6, 8, 9 or 14, then push L, L, R, R, click Left Thumb-stick, 
Right Thumb-stick while you are at the armory screen before launch. 

Change music:
Click Left Thumb-stick(2 times), Right Thumb-stick(2 times), then 
push L, R while you are at the title screen. 

Skip missions:
Click Left Thumb-stick, push White, White, Back, click Right Thumb-stick, 
push White  during a mission. 

Infiltration radar:
Fly over the radars as high as you can, to avoid them.

Custom soundtrack:
Enter to the options menu at the main screen. If you have already created 
your own soundtrack on your Xbox hard drive, you can listen to it while playing.