Cheats are unlocked not by inserting passwords, but by acquiring the thirty Intel Pieces strewn throughout the game. The more of them you collect, the more cheats you can access. On the left are the number of Intel Pieces collected, and on the right are the cheats that are unlocked, with an explanation of what each does.

• 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" Just what it says.

To insert the following codes, enable the console from the in-game options. Press ~ and type in "seta thereisacow 1337", pressing Enter thereafter. From here, type "spdevmap bog_a" and press Enter again. Then, you can insert the following cheats.

• cg_drawgun - Drop your gun
• cg_fov - Zoom with any gun
• cg_LaserForceOn 1 - Laser site with any gun
• demigod - God Mode (with shaking screen)
• give (item) - Acquire any item
• give all - Get any weapon
• give ammo - Full ammo
• god - God Mode (without screen shaking)
• jump_height # - Adjust gravity (39 is default)
• noclip - No Clipping
• notarget - Dumb AI
• r_fullbright - Brighter features
• timescale # - Adjust the time (1.00 is default)
• ufo - No Clipping (II)

To unlock Arcade Mode, beat the game once through on any difficulty level. Arcade Mode itself is split into two options - Full Challenge or Level Challenge - that add extra replayability to the game.

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.

To unlock the following weapons in multiplayer mode, reach the numbered rank listed.

• 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

To unlock the following "Golden" weapons, fulfill the requirement listed.

• AK-47 - Complete all Assault Rifle challenges
• Desert Eagle - Attain Level 55
• Dragonuv - Complete all Sniper Rifle challenges
• M1014 - Complete all Shotgun challenges
• M60 - Complete all LMG challenges
• Mini-Uzi - Complete all SMG challenges

Below is the level distribution list for Intel Pieces, which are enemy laptops full of information strewn throughout the game. There are thirty of them total. The left column is the level in question, while the right column is how many Intel Pieces can be found on that level. Levels with no Intel Pieces are excluded completely.

• 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

You can unlock all of the intel laptops automatically on the PC version of CoD4, but since you'll need to mess with your game's files a little bit, you're doing so at your own risk.

Simply go to your player profile (it will look something like this: C:\program files\Activision\Call of Duty 4 - Modern Warfare\players\profiles\player\YOURPROFILENAMEHERE), and search for a file called config.cfg.

Open the file by double-clicking it (or right-click it and open it in Notepad) and search for "cheat_points", minus the quotes, via the CTRL+F function. There will be a number next to cheat_points -- change it to "30" and all intel laptops will be automatically unlocked!