How Cheats Work

Cheats work differently in Call of Duty 4. You need to acquire thirty Intel pieces that are scattered around the levels. Each of the 30 Intel pieces allow you to unlock a particular cheat code. On the left side are the number of pieces you have acquired, and on the right is a description of the cheat. 2 - "CoD Noir" Play the game in black and white. 4 - "Photo-Negative" Game colors become inverted. 6 - "Super Contrast" Game's contrast increases. 8 - "Ragtime Warfare" The game feels like an old silent movie. 10 - "Cluster Bombs" One frag grenade thrown equals five in explosion. 15 - "A Bad Year" Enemies explode into tires when shot. 20 - "Slow-Mo Ability" Game plays at 40% normal speed. 30 - "Infinite Ammo" Gives you unlimited ammo.

Unlockable: Arcade Mode

To unlock Arcade Mode, you must complete the game on any difficulty level. Arcade Mode is split into two different options: Full Challenge or Level Challenge that give a good reason to play though the levels again.

Unlockable: Prestige Mode

To unlock Prestige Mode that is in the multiplayer mode you must attain experience level 55. Instead of capping out at level fifty-five which is the highest level, Prestige Mode allows you to start again from level one. This can be done a total of ten times, giving you ten different icons in in-game lobbies to show your extreme achievement.

Unlockable: New Mission

To play an all-new mission, which is an extra mission after the main quest is completed, beat the game and view the ending credits thereafter. After they've run their course, you will then be given the opportunity to play one last single player mission before all is said and done.

Unlockable: Multiplayer Weapons

When you reach the ranks below, you can unlock the associated weapon in multiplayer mode. Assault Rifle (G3) - Rank 25 Assault Rifle (G36C) - Rank 37 Assault Rifle (M14) - Rank 46 Assault Rifle (M4) - Rank 10 Assault Rifle (MP44) - Rank 52 LMG (M60E4) - Rank 19 Pistol (Desert Eagle) - Rank 43 Pistol (Golden Desert Eagle) - Rank 55 Pistol (M1911) - Rank 16 Shotgun (M1014) - Rank 31 SMG (AK-74U) - Rank 28 SMG (Mini Uzi) - Rank 13 SMG (P90) - Rank 40 Sniper Rifle (Barret) - Rank 49 Sniper Rifle (Dragunov) - Rank 22 Sniper Rifle (M40) - Rank 04 Sniper Rifle (R700) - Rank 34

Unlockable: Golden Weapons

To unlock the following Golden weapons, fulfill the requirement listed. AK-47 - Complete all Assault Rifle challenges Desert Eagle - Reach Level 55 Dragonuv - Finish all Sniper Rifle challenges M1014 - Finish all Shotgun challenges M60 - Finish all LMG challenges Mini-Uzi - Finish all SMG challenges

Hint about Intel Pieces

The data below shows you how many Intel pieces there are in each level, which are laptops full of information around the game, with there being 30 in total to collect. On the right are the amount of pieces while the left is the level they are found. Levels with no Intel Pieces are not mentioned. Level 2 - 2 Level 4 - 2 Level 5 - 3 Level 6 - 2 Level 7 - 2 Level 9 - 3 Level 10 - 2 Level 12 - 2 Level 13 - 3 Level 14 - 2 Level 16 - 2 Level 17 - 1 Level 18 - 2 Level 19 - 2