• Authentic advanced weaponry: Featuring an available arsenal of more than 70 and authentic weapons and gear including assault rifles with laser sites, claymore mines, .50 caliber sniper rifles, and machine guns, as well as accessories like night-vision goggles and ghillie suits for maximum concealment, Call of Duty 4: Modern Warfare has you locked and loaded to accomplish your mission.
• Coordinated assault and support: Delivering the most visceral action thriller ever, cover modern battle from the soldier to the satellite, where the need for air support is critical to success. The rapid deployment gives you an adrenaline rush as you fast-rope from tactical helicopters, ride in an armada of attack choppers, utilize jets to remove enemy strongholds, and even engage hostiles from thousands of feet above the ground inside a state-of-the-art aerial gunship.
• Cinematic graphics and sound: Featuring stunning next-generation graphics, experience the cinematic intensity of Call of Duty 4: Modern Warfare . Amazing special effects, including realistic depth of field, rim-lighting, character self-shadowing, texture streaming, as well as physics-enabled effects enlists you into the most photo-realistic gaming experience ever. Combine the lifelike graphics and the realistic battle chatter with the Call of Duty award-winning sound design and get ready to face battle as you have never before. 
• Unparalleled depth of multiplayer: Multiplayer builds from the success of Call of Duty 2, delivering a persistent online experience for greater community interaction. The create-a-class options let you customize gear that is best suited for play, to experience points enabling unlockables and perks, all the way to matchmaking and leaderboards for the latest in tracking, Call of Duty 4: Modern Warfare 's multiplayer is set to deliver easily accessible and addictive online play for all.

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 only for singleplayer

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)

Unlockable: Arcade Mode
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.

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
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
Unlockable: Golden Weapons

Hint: Intel Pieces
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