Easy kills:
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Walk around with your machine gun to easily kill opponents in close combat.
However, if you see a sniper at a distance, press R3 to quickly use your
sniper rifle.
Bonus mission:
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Successfully complete the game on any difficulty setting to unlock a bonus mission.
Exploding bullets:
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Enter Panzer as a profile name.
Make your rounds silent:
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Enter Stealth as your profile name.