- Killstreak bonuses
Get the indicated number of consecutive kills in Multiplayer mode to get the corresponding bonus:

Blackbird	8 kills (shows both enemy position and direction on the mini-map; cannot be shot down)
RC-XD	3 kills (remote control car strapped with explosives)
Attack Helicopter	7 kills (call in support helicopter)
Mortar Team	6 kills (target three locations to bombard with Mortar Strikes)
Sentry Gun	6 kills (airdrop a placeable Sentry Gun)
Care Package	5 kills (airdrop a random killstreak or ammo crate)
SAM Turret	4 kills (airdrop a placeable SAM turret to destroy enemy aircraft)
Rolling Thunder	8 kills (carpet bombing airstrike)
Counter Spy Plane	4 kills (temporarily disables enemy mini-map)
Napalm Strike	5 kills (aircraft covers an area in Napalm)
Spy Plane	3 kills (shows enemies on the mini-map; can be shot down)
Attack Dogs	11 kills (attack dogs that hunt down the enemy)
Chopper Gunner	9 kills (be the gunner of an attack helicopter)
Valkyrie Rockets	7 kills (launcher with remote controlled rockets)
Gunship	11 kills (pilot an attack helicopter)

- Hidden Thunder Gun in 'Numbers' mission
At the beginning of Mission 7: Numbers, after the Nova 6 Gas is released, go to the back of the room, and enter the office. Find the tape recorder, and keep pushed [Action] to pick it up. If done correctly, the screen will shake. Continue through the level until you get to the part where you jump off the roof into the building and onto the mattress. Once Clarke is inside, he will move a fridge leading to the weapon stash. You must watch him move the fridge or you will not get the Thunder Gun. Once you get inside the stash, go to the left. You should see another tape recorder. Walk up to it, and keep pushed [Action] to pick it up. If done correctly, the screen will shake and the Thunder Gun will appear from the wall. You can trade the weapon you are keep pusheding for it, and it will be equipped with twelve shots. After you get the Thunder Gun, the rest of the level should be very easy.


In Mission 7: Numbers, after interrogating Clarke, several enemy soldiers will appear at the end of the long hallway. If you shoot all six Nova 6 canisters (two in the back, four on the sides), you can retrieve a cassette tape in the office behind where you begined. Notice: It is recommended that you toss a flashbang to blind the enemies so you can shoot the canisters more easily. Once you pick up the tape, continue progressing through the mission until the part where Weaver and Clarke both jump off the roof and onto a mattress. After they jump down, Clarke will ask Weaver to help him move a fridge out of the way to his first weapon stash. Once they do, go inside, and look to the left. There should be a place to put the cassette. Notice: When picking up and placing the cassette tape, the game will not prompt you to do anything -- you must use this information to know when to do these things. Once you insert the cassette tape, the screen will shake, and the Thunder Gun will appear out of the wall. It has twelve bullets, and it is reloaded at checkpoints.

- Activate Cheats
At the main menu, use the Analog-stick to look down at your hands and see you are locked up. Repeatedly press ZL + ZR on a Classic Controller to escape from the chair. After breaking free, move around to the area behind your chair to find an old computer terminal you can use to access the Central Intelligence Agency Data System. Type one of the following codes to access early unlockables and hidden features in the game. Notice: You can also plug a USB keyboard into your Wii to enter the codes and play the Zork text-based adventure game.

Open mail folder for current user Enter 'MAIL' as a code to open the mail folder for the current user.
All Intel Enter '3ARC INTEL' as a code to unlock all Intel.
List of login names Enter 'WHO' as a code to display a list of login names for use with the 'RLOGIN' command (requires passwords).
List audio files and pictures Enter 'DIR' as a code to display a list of audio files and pictures for use with 'CAT' command.
Mission select Enter '3ARC UNLOCK' as a code to unlock all missions.
Zork game Enter 'ZORK' or 'HELLO SAILOR' as a code to unlock the Zork	The Great Underground Empire text-based adventure game.
Display contents of current directory Enter 'DIR' or 'LS' as a code to display the contents of the current directory.
Open corresponding file Enter 'CAT [filename]' or 'PRINT [filename]' as a code to open the corresponding file.
Alicia game Enter 'ALICIA' as a code to unlock the Alicia virtual therapist game.
Display all commands Enter 'HELP' as a code to display a list of system commands in the terminal and Pentagon user e-mail access.
Decode a string using the CIA's cypher Enter 'DECODE' as a code to decode a string using the CIA's cypher.
Encode a string using the CIA's cypher Enter 'ENCODE' as a code to encode a string using the CIA's cypher.
Login Enter 'LOGIN' as a code to login with a corresponding username and password.
Display 'Fee Fie Foe Foo!' Enter 'FOOBAR' as a code to display 'Fee Fie Foe Foo!'.

- Dreamland server
Access the Central Intelligence Agency Data System. Enter 'rlogin dreamland' as a command. You will be prompted to login with an account with MJ12 access. Use one of the following usernames and passwords to continue:

Login as Robert Oppen	Username
Login as T. Walker	Username
Login as Vannevar Bush	Username

- Hear 'Sympathy For The Devil' song by The Rolling Stones in 'Nuketown' map
In the Nuketown map, shoot the heads off all the mannequins in under fifteen seconds of the round begginning to hear the song 'Sympathy For The Devil' by The Rolling Stones played over the loudspeakers.

- Multiplayer unlockables
Reach the indicated rank to unlock the corresponding bonus:

Prestige 10	Prestige Hardcore Playlist
Level 8	Game Mode Challenges
Level 22	Camo
Level 10	Killstreaks, Killstreak Challenges, Playercard Emblems
Prestige 7	Custom Class 9
Level 4	Create A Class
Prestige 1	Prestige Leaderboard, Custom Class 6
Prestige 5	Custom Class 8
Level 31	Facepaint
Level 5	Contracts
Level 30	Final Challenges
Prestige 11	Additional Face Paint
Prestige 3	Custom Class 7
Level 16	Gun Emblems
Level 28	Custom Lenses
Level 50	Prestige Mode
Level 13	Combat Record
Level 25	Custom Reticules
Prestige 14	Golden Camo
Level 15	Medal Challenges
Prestige 13	Clan Tag Colors
Level 6	Clan Tag
Level 20	Elite Challenges
Level 19	Gun Tag
Prestige 9	Custom Class 10
Prestige 15	Prestige Pure Playlist

- Terminal access
Access the Central Intelligence Agency Data System. Enter 'login' as a command. You will be prompted to login with an account. Use one of the following usernames and passwords to continue. You can then access their documents with the 'dir' command or e-mail with the 'mail' command.

Person	Username	Password
T. Walker	twalker	radi0
Bruce Harris	bharris	goskins
Jason Hudson	jhudson	bryant1950
Richard Kain	rkain	sunwu
Adrienne Smith	asmith	roxy
Richard Helms	rhelms	lerosey
Lyndon B. Johnson	lbjohnson	ladybird
Alex Mason (default account)	amason	password
John F. Kennedy	jfkennedy	lancer
Terrance Brooks	tbrooks	lauren
Frank Woods	fwoods	philly
Joseph Bowman	jbowman	uwd
Richard Nixon	rnixon	checkers
John McCone	jmccone	berkley22
William Raborn	wraborn	bromlow
D. King	dking	mfk
Vannevar Bush	vbush	manhattan
J. Turner	Jturner	condor75
Grigori 'Greg' Weaver	gweaver	gedeon
Ryan Jackson	rjackson	saintbridget

- Intel locations
Search the indicated locations to find all 42 Intel laptops:


Mission 1: Operation 40



Mission 2: Vorkuta



Mission 3: U.S.D.D.



Mission 4: Executive Order



Mission 5: S.O.G.

Mission 6: The Defector



Mission 7: Numbers



Mission 8: Project Nova



Mission 9: Victor Charlie



Mission 10: Crash Site



Mission 11: WMD



Mission 12: Payback



Mission 13: Rebirth



Mission 14: Revelations



Mission 15: Redemption





- Clearing the trenches in battle of Khe Sanh
At the battle of Khe Sanh, you are told to clear the trenches, but it is not exactly clear how to do this. You must run to the two giant striped barrels near the bottom of the hill and kick them down into the trench. Hide behind the sandbags, and shoot at the Viet Cong until it is relatively clear. Then, run to the nearby barrel, and follow the prompt to stab it and kick it down the hill.

- Perks
The following is a list of perks and their effect. Successfully complete the indicated challenges to unlock the pro version of the corresponding perk.


Tier 1


Lightweight

Lightweight	Move faster
Lightweight Pro	Move faster, and no fall damage

Challenges

Melee Kills	Get 15 melee kills.
Escape Death	Escape death 5 times after being hurt.
Offense Medals	Get 10 offense medals by killing enemies near their objective.

Scavenger

Scavenger	Replenish ammo and lethal grenades from fallen enemies
Scavenger Pro	Replenish ammo and lethal grenades from fallen enemies, and begin with extra mags and replenish tactical grenades from fallen enemies

Challenges

Resupplies	Resupply 150 times while using Scavenger.
Grenade Kills	Get 5 lethal grenade kills with a resupplied grenade.
Kill Count	Get 5 kills without dying 5 times.

Ghost

Ghost	Remain hidden from enemy spy planes
Ghost Pro	Remain hidden from enemy spy planes, and avoid targeting from aircraft, IR scopes, and Sentry Guns; no red crosshair or name when targeted

Challenges

Concealed Kills	Kill 20 enemies while they have a spy plane or Blackbird active.
Destroy Aircraft	Destroy 30 aircraft with any non-killstreak launcher.
Destroy Sentry Gun	Destroy 1 Sentry Gun.

Flak Jacket

Flak Jacket	Take less explosive damage
Flak Jacket Pro	Take less explosive damage, and deflect fire damage and safely toss back frag grenades

Challenges

Protected	Survive 10 explosions while using Flack Jacket.
Demolished	Plant or defuse 10 bombs in Demolition, Sabotage, or Search & Destroy.
Throwbacks	Throw back 5 enemy frag grenades.

Hardline

Hardline	Get killstreak rewards with one less kill
Hardline Pro	Get killstreak rewards with one less kill, and change the contents of a care package

Challenges

Share Packages	Share 10 Killstreak reward crates with teammates.
Multiple Killstreaks	Get 7 killstreaks in one match while using Hardline.
Killstreak	Get 7 kills without dying in one match.

Tier 2


Hardened

Hardened	Penetrate walls and objects with deeper bullet impact
Hardened Pro	Penetrate walls and objects with deeper bullet impact, and inflict extra bullet damage on aircraft and turrets, and flinch less when shot

Challenges

Penetration Kills	Get 10 kills using Hardened and shooting through walls.
Bullets in Aircraft	Shoot 200 bullets into enemy aircraft.
Equipment Shot	Destroy 1 piece of enemy equipment through a wall.

Scout

Scout	Keep pushed breath longer when scoped
Scout Pro	Keep pushed breath longer when scoped, and switch weapons faster

Challenges

Secondary Kills	Get 50 kills with secondary weapons.
One Shot Kills	Get 50 'One Shot, One Kill' medals.
Headshots	Get 30 headshot kills.

Steady Aim

Steady Aim	Maintain increased accuracy when firing from the hip
Steady Aim Pro	Maintain increased accuracy when firing from the hip, and aim faster after sprinting, and recover quickly from knife lunges

Challenges

Quick Melee	Melee two enemies consecutively within 5 seconds.
Sprint Kills	Get 100 kills after sprinting.
Hip Fire Kills	Get 150 hip fire kills using Steady Aim.

Sleight Of Hand

Sleight Of Hand	Reload weapons faster
Sleight Of Hand Pro	Reload weapons faster, and aim down sights faster with all weapons, except sniper rifles

Challenges

Aiming Kills	Get 150 kills while aiming down sights.
Reload Kills	Kill an enemy within 5 seconds of reloading 30 times.
Fast Hand Kills	Reload and finish off the enemy you wounded 10 times.

Warlord

Warlord	Equip two attachments to your primary weapon (excluding underbarrels)
Warlord Pro	Equip two attachments to your primary weapon (excluding underbarrels), and begin with one extra tactical and lethal grenade, except Willy Pete

Challenges

Two Attachment Kills	Get 150 kills using a gun with two attachments.
Grenade Kills	Get 10 Frag or Semtex kills.
Grenade Multi-kills	Get 1 multi-kill with Frag or Semtex.

Tier 3


Tactical Mask

Tactical Mask	Protect yourself against Nova Gas
Tactical Mask Pro	Protect yourself against Nova Gas, and reduce the effects of Flash and Concussion grenades, and reveal the position of a flashed or stunned enemy

Challenges

Flash Kills	Kill 20 enemies that are blinded by your Flashbang grenade.
Concussion Kills	Kill 20 enemies that are stunned by your Concussion grenade.
Nova Gas Kills	Kill 20 enemies poisoned by your Nova Gas.

Marathon

Marathon	Sprint for a longer duration
Marathon Pro	Sprint for a longer duration, and sprint for an unlimited duration

Challenges

26 Miles	Sprint 26 miles using Marathon.
First Blood	Get the 'First Blood' medal 10 times.
Captures	In Capture The Flag, get the 'Flag Capture' medal 15 times while using Marathon.

Ninja

Ninja	Move silently
Ninja Pro	Move silently, and make no noise at all and hear enemies louder

Challenges

Silenced Kills	Get 150 kills using the Suppressor attachment.
Back Stabs	Get 5 'Backstabber' medals.
Plants	Plant the bomb 10 times in Demolition, Sabotage, or Search & Destroy.

Second Chance

Second Chance	Pull out your pistol before dying
Second Chance Pro	Pull out your pistol before dying, and survive longer and get revived by your teammates

Challenges

Kills	Get 10 kills while in Second Chance.
Revenge	While in Second Chance, kill the enemy who downed you 5 times.
Headshot	Get 1 headshot kill while in Second Chance.

Hacker

Hacker	Detect enemy equipment, explosives, and turrets
Hacker Pro	Detect enemy equipment, explosives, and turrets, and sabotage enemy equipment and turrets, and booby trap stolen crates, and remain invisible to motion sensors

Challenges



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Destroys	Destroy 10 equipment or explosives while using Hacker.
Explosive Kills	Kill 25 enemies with a Claymore or C4.
Near Equipment Kills	Kill 25 enemies within the radius of your Jammer or Motion Sensor.