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Call of Duty 4: Modern Warfare

Also known as: CoD 4

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Call of Duty 4: Cheats Unlocked

A video guide to every hidden item and secret mode in the game

Words: Charlie Barratt, GamesRadar US

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Halo has skulls. Gears has cogs. Grand Theft Auto has packages. But this year's most rewarding collectible hunt isn't in any of those games... it's in Call of Duty 4.

Scattered throughout the shooter are 30 hidden laptops, capable of unlocking some of the most useful - and bizarre - cheats we've ever encountered. Ranging from infinite ammo to super powered grenades to a "silent 1920s movie" filter (seriously!) these things can transform the game until it's nearly unrecognizable.

Want to see what we're talking about? The video below demonstrates all of Call of Duty 4's cheats in action. When you're done, and dying to try the special modes out for yourself, click through the page tabs on the left. Our mission-by-mission walkthrough will guide you to each and every laptop with text, screens AND video. Happy hunting.

In addition to the two Achievements worth 40 points, locating intelligence laptops will unlock the following cheats upon beating the single player campaign:

Beat the Game with No Intel: Arcade Mode
Compete for high scores with limited lives.

With 2 out of 30 Intel: Noir
Turns the game colors black and white.

With 4 out of 30 Intel: Photo-Negative
Inverts the game colors.

With 6 out of 30 Intel: Super Contrast
Turns up the color contrast in the game.

With 8 out of 30 Intel: Ragtime Warfare
Adds a sepia-toned old film filter, speeds the game up 70% and replaces sound with looping 1920s jazz music.

With 10 out of 30 Intel: Cluster Bombs
Frag grenades thrown by the player explode into five more live grenades.

With 15 out of 30 Intel: A Bad Year
Enemies explode into a cloud of bouncing, rolling car tires when killed.

With 20 out of 30 Intel: Slow-Mo Ability
Clicking the right thumbstick slows the game down 40%.

With 30 out of 30 Intel: Infinite Ammo
Gives the player infinite ammo on all weapons.