You can hack cheat mode by completing the game, a cheat option will then appear during your gameplay under the options. Then collect Intel.
Here is a list of pieces amount you need to collect:
A Bad Year - 15 Intel Pieces. Enemies explode into tires when shot.
Cluster Bombs - 10 Intel Pieces. When a frag grenade explodes, four more will explode in a cross-shaped pattern.
CoD Noir - 2 Intel Pieces. Allows black and white graphics.
Infinite Ammo - 30 Intel Pieces. Reloads are no longer necessary. This has no effect with single-shot weapons such as RPGs, C4, or Claymores.
Photo-Negative - 4 Intel Pieces. Inverts the colors.
Ragtime Warfare - 8 Intel Pieces. Gets you into silent mode.
Slow-Mo Ability - 20 Intel Pieces. The game (at melee) decreases game speed twice.
Super Contrast - 6 Intel Pieces. This one gets the contrast increased.
Enjoy this cheat.
Provided by Digger.
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