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The Ultimate Modern Warfare 2 Multiplayer Guide
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Basically this guide is about MW2, the guns, attachments, perks, killstreaks, deathstreaks, maps, and game modes.
I hope you find this helpful and interesting 
Created to help NGU users and know the MW2 multiplayer basics.
Anthing you think should be added just comment and I will add your input if needed andcredit to you.
Enjoy,
xWiiNtY
Some of the information was sourced from sites, and it not all mine
Sites:
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P.S. Yes a lot of this was copy and pasted with added bits from me, however it did take a while to put together, so please don't hate

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[multipage=Options]
Options
Stick Layout: These four presets (default, southpaw, leagacy and legacy southpaw) determine which each thumbstick does. Choose the one to suit you.
Button Layout: You can select from three choices: default, tactical, lefty and the flipped of each. Choose the one to suit your style.
Sensitivity: There are three settings available (low, medium and high) along with a fourth customizable setting. Take into consideration the game mode you are playing and the gun you are using.
Look Inversion: When enabled, this option makes your character look up when you press down and down when you press up.
Vibration: Can be enabled or disabled, it's down to your personal preferance also whether your controller is compatible with this function.
Game Volume and Brightness: Edit these options to your personal preferance.
[multipage=Guns]
Guns
Here is a list of all the guns and the levels at which they are obtained.
ASSAULT RIFLES
M4A1 - Default Weapon
FAMAS - Default Weapon
SCAR-H - Levl 8
TAR-21 - Level 20
FAL - Level 28
M16A4 - Level 40
ACR - Level 48
F2000 - Level 60
AK47 - Level 70
SUB MACHINE GUNS
MP5K - Default Weapon
UMP45 - Default Weapon
Vector - Level 12
P90 - Level 24
Mini Uzi - Level 44
LIGHT MACHINE GUNS
L86 LSW - Default Weapon
RPD - Default Weapon
MG4 - Level 16
AUG HBAR - Level 32
M240 - Level 52
SNIPER RIFLES
Intervention - Default Weapon
Barret .50cal - Default Weapon
WA2000 - Level 36
M21 EBR - Level 56
MACHINE PISTOLS
PP2000 - Default Weapon
G18 - Level 22
M93 Raffica - Level 38
TMP - Level 58
SHOTGUNS
SPAS-12 - Default Weapon
AA-12 - Level 18
Striker - Level 34
Ranger - Level 42
M1014 - Level 54
Model 1887 Level 67
HANDGUNS
USP .45 - Default Weapon
.44 Magnum - Level 26
M9 - Level 46
Desert Eagle- Level 62
LAUNCHERS
AT4-HS - Default Weapon
Thumper x2 - Level 14
Stinger - Level 30
Javelin - Level 50
RPG x2 - Level 65
[multipage=Attachments]
Attachments
Here is a list of all the available attachments with each set of guns.
ASSAULT RIFLE ATTACHMENTS
- No Attachment
- Grenade Launcher (10 Kills)
- Red Dot Sight (25 Kills)
- Silencer (75 Kills)
- ACOG Scope (150 Kills)
- FMJ (300 Kills)
- Shotgun (20 Kills with the Grenade Launcher attached)
- Holographic Sight (60 Kills with the Red Dot Sight attached)
- Heartbeat Sensor (15 Kills with the silencer attached)
- Thermal (20 Kills with the ACOG Sight attached)
- Extended Mags (40 bullet penetration kills while using FMJ)
SNIPER RIFLE ATTACHMENTS
- No Attachment
- Silencer (75 Kills)
- ACOG Scope (150 Kills)
- FMJ (300 Kills)
- Heartbeat Sensor (15 Kills with the silencer attached)
- Thermal (20 Kills with the ACOG Sight attached)
- Extended Mags (40 bullet penetration kills while using FMJ)
LIGHT MACHINE GUN ATTACHMENTS
- No Attachment
- Grip (10 Kills)
- Red Dot Sight (25 Kills)
- Silencer (75 Kills)
- ACOG Scope (150 Kills)
- FMJ (300 Kills)
- Holographic Sight (60 Kills with the Red Dot Sight attached)
- Heartbeat Sensor (15 Kills with the silencer attached)
- Thermal (20 Kills with the ACOG Sight attached)
- Extended Mags (40 bullet penetration kills while using FMJ)
SUB MACHINE GUN ATTACHMENTS
- No Attachment
- Rapid Fire (10 Kills)
- Red Dot Sight (25 Kills)
- Silencer (75 Kills)
- ACOG Scope (150 Kills)
- FMJ (300 Kills)
- Akimbo (30 Kills with the Rapid Fire attached)
- Holographic Sight (60 Kills with the Red Dot Sight attached)
- Thermal (20 Kills with the ACOG Sight attached)
- Extended Mags (40 bullet penetration kills while using FMJ)
[multipage=Equipment]
Equipment
Frag - Default
Semtex - Default
Throwing Knife - Level 7
Tactical Insertion - Level 11
Blast Shield - Level 19
Claymore - Level 31
C4 - Level 43
SPECIAL GRENADES
Stun x2 - Default
Flash x2 - Default
Smoke - Default
RIOT SHIELD
Shield - Default
[multipage=Perks]
Perks
Perks are special abilities / power ups for multiplayer combat. There are only 3 perk slots available to you and each slot consist of different types of perks, so choosing the right ones for your class is crucial.
Unlike in the previous Call of Duty games, each perk can now be upgraded to a Pro version by completing its challenge. Note: Pro perks are additions to each perk, they don't replace them.
Perk Slot 1
Marathon | Marathon Pro
Marathon Perk Ability: Unlimited sprint.
Pro Ability: Get over obstacles faster.
Sleight of Hand | Sleight of Hand Pro
Sleight of Hand Perk Ability: Faster reloading.
Pro Ability: Gives a speed boost to how fast you can aim down the sight of your weapon.
Scavenger | Scavenger Pro
Scavenger Perk Ability: Full resupply from dead enemies.
Pro Ability: Extra magazines.
Bling | Bling Pro
Bling Perk Ability: 2 primary weapon attachments.
Pro Ability: 2 secondary weapon attachments.
One Man Army | One Man Army Pro
One Man Army Perk Ability: Replaces your secondary weapon. This allows you to change your class at any given time during a match.
Pro Ability: Swaps classes even faster.
Perk Slot 2
Stopping Power | Stopping Power Pro
Stopping Power Perk Ability: Increased bullet damage.
Pro Ability: Increased bullet damage vs. helicopters and aircrafts.
Lightweight | Lightweight Pro
Lightweight Perk Ability: Move faster.
Pro Ability: Allows you to do a quick aim after sprinting.
Hardline | Hardline Pro
Hardline Perk Ability: Killstreaks require 1 less kill.
Pro Ability: Death Streaks require 1 less death.
Cold-Blooded | Cold-Blooded Pro
Cold-Blooded Perk Ability: Undetectable by UAV, air support, Sentry Guns, and thermal.
Pro Ability: No red crosshair or name shown when you are targeted.
Danger Close | Danger Close Pro
Danger Close Perk Ability: Increases explosive weapons damage.
Pro Ability: Increases air support damage.
Perk Slot 3
Commando | Commando Pro
Commando Perk Ability: Increased melee distance.
Pro Ability: You don't take any damage from falling.
Steady Aim | Steady Aim Pro
Steady Aim Perk Ability: Increased hip-fire accuracy.
Pro Ability: You can hold your breath for a longer period of time.
Scrambler | Scrambler Pro
Scrambler Perk Ability: Scrambles (jams) the enemy radar in a small radius.
Pro Ability: Delays enemy Claymores, thus allowing you to avoid the explosion if you are fast enough.
Ninja | Ninja Pro
Ninja Perk Ability: Invisible to heartbeat sensors.
Pro Ability: Allows you to move silently.
SitRep | SitRep Pro
SitRep Perk Ability: Insertions. This will reveal enemy explosives and Tactical Insertions.
Pro Ability: Makes enemy footsteps louder.
Last Stand | Last Stand Pro
Last Stand Perk Ability: Allows you to survive a normal death. You will drop to the ground and pull out your pistol.
Pro Ability: This allows you to use your equipment too, for example, frag grenades and throwing knives.
[multipage=Killstreaks]
Killstreaks
Killstreak Rewards are special bonuses that can be acquired by killing a certain amount of enemies in a row without dying. You can lower the required amount by 1 with the Hardline perk.
Modern Warfare 2 expands the killstreak system from Call of Duty 4 and World at War. You have 3 killstreak rewards that you can customize to your liking. You start off with the UAV, Care Package and Predator Missile. As you reach level 10 and beyond, you earn points which you can use to unlock the rest of the killstreaks in any order you choose.
Killstreaks stack up, meaning that you don't lose a UAV after gaining, for example, a Predator Missile. Stacked up killstreaks can't be used as pleased, instead they need to be used in the order you've acquired them.
All killstreak kills (Predator Missiles, Airstrikes, etc.) count towards your next killstreak, except for those that have been acquired from Care Packages. All killstreaks that have been earned during previous lives will not add to your total.
# 3 Kills
UAV
UAV Description: This deploys a UAV (unmanned aerial vehicle) that shows enemies on the radar for 30 seconds. Multiple UAVs (from the same team) makes the refresh rate faster.
Unlike in Call of Duty 4, UAVs fly around the map, so they can be shot down. They are rather weak, so it's better to use your primary weapon rather than wasting a valuable missile on them. Players using the Cold-Blooded perk won't show up on the radar.
# 4 Kills
Care Package
Care Package Description: Airdrops a random killstreak or ammo. If you can't get to the high level killstreaks on your own, use this. Just throw the red signal flare and wait for the helicopter to drop the package. The package can be stolen by anyone, even by your team mates, so be careful!
Care Packages can be seen on the radar by everyone. It's marked green if it's friendly, otherwise red since it belongs to the enemy team. Care Packages, Emergency Airdrops and Tactical Nukes can't be acquired from the package. Below are the drop rates:
14.78% - Ammo
14.78% - UAV
13.04% - Counter-UAV
10.43% - Sentry Gun
10.43% - Predator Missile
9.57% - Precision Airstrike
6.09% - Harrier Strike
6.09% - Attack Helicopter
4.35% - Pave Low
4.35% - Stealth Bomber
2.61% - Chopper Gunner
2.61% - AC-130
0.87% - EMP
Counter-UAV
Counter-UAV Description: Scrambles the enemy radar for a short period of time, even if they don't have a UAV in the air.
Counter-UAVs fly around the map, so they can be shot down just like regular UAVs.
# 5 Kills
Sentry Gun
Sentry Gun Description: Airdrop a placeable XM312 Sentry Gun. A helicopter will drop the weapon, which you can pick up and place anywhere you want. The Sentry Gun (box) can be stolen by anyone, just like the Care Package, so be sure to pick it up straight away. You can move the Sentry Gun around even after you've deployed it, but it won't fire until it's placed.
The Sentry Gun has a 180 degree turn on its turret and can pitch up and down, but it can't detect players using the Cold-Blooded perk. They are most effective when placed in high places.
Sentry Guns can be temporarily disabled with Flashbangs and Stun Grenades. Normal weapons don't do much damage to it, so use explosives instead. You can instantly destroy them with a melee hit or a Throwing Knife - silly, but true. The turret can over-heat if it's fired for too long, so use that to your advantage. The Sentry Gun will disable itself after 90 seconds.
Predator Missile
Predator Missile Description: Allows you to remote control a Predator Missile to the ground. Your screen will change to an overhead view and you have approximately 5 seconds to control the missile to your target. You can give the missile a boost to make it go down faster.
Enemies that don't have the Cold-Blooded perk will appear with a red box around them. The Predator Missile has a moderate explosion radius, so you don't need to hit the enemy dead-on. You can also use it to take down enemy helicopters and harriers.
You are vulnerable while controlling the Predator Missile, but if you get killed on the ground, you can still continue your missile attack.
# 6 Kills
Precision Airstrike
Precision Airstrike Description: This is much like the Airstrike from Call of Duty 4, but this time you can control the direction of the Airstrike for more accurate kills.
# 7 Kills
Harrier Strike
Harrier Strike Description: Airstrike with a hovering harrier. The selected area gets bombed, after that a hovering harrier will guard the area for 45 seconds and tries to kill all nearby enemies. It can also attack enemy helicopters.
This basically combines the Airstrike and Attack Helicopter to one neat package, but the harrier doesn't circle the map, it just stays still. Harriers can be destroyed with one stinger/javelin missile.
Attack Helicopter
Attack Helicopter Description: Deploys a Attack Helicopter to the map, just like in Call of Duty 4. It will circle around the map and automatically attack enemies for 60 seconds.
Attack Helicopters can be destroyed with one stinger/javelin missile.
# 8 Kills
Emergency Airdrop
Emergency Airdrop Description: Calls in a cargo plane that drops 4 Care Packages.
Try to avoid situations where the packages land outside the map. The plane always comes from the opposite direction you're facing (when throwing the red signal flare) and flies in a straight line.
Care Packages, Emergency Airdrops, EMPs and Tactical Nukes can't be acquired from the packages. Below are the drop rates:
12% - Ammo
12% - UAV
16% - Counter-UAV
16% - Sentry Gun
14% - Predator Missile
10% - Precision Airstrike
5% - Harrier Strike
5% - Attack Helicopter
3% - Pave Low
3% - Stealth Bomber
2% - Chopper Gunner
2% - AC-130
# 9 Kills
Pave Low
Pave Low Description: Calls in a heavily armored attack helicopter (Sikorsky MH-53 Pave Low) to patrol the map for 60 seconds. It works just like the Attack Helicopter, but it has twice the armor and two turrets.
The Pave Low also has chaff (1 set) as a countermeasure, so the first locked-on missile won't hit it.
Stealth Bomber
Stealth Bomber Description: Calls in a Stealth Bomber (B-2 Spirit) to carpet bomb the selected area. You can also control the direction, just like with the Precision Airstrike.
The airstrike doesn't show on enemy radar.
# 11 Kills
Chopper Gunner
Chopper Gunner Description: Be the gunner of an attack helicopter. Your screen changes to the gunners view and the helicopter will fly around the map. The helicopter flies around for 40 seconds before it leaves, which does not include the time it takes to travel to the map.
The 25mm gun doesn't need to be reloaded, so you can easily kill multiple enemies. Enemies that don't have the Cold-Blooded perk will appear with a red box around them. You are also vulnerable while using this killstreak, but if you get killed on the ground, you can still continue your session.
The helicopter has 1 set of flares, so the first locked-on missile won't hit it.
AC-130
AC-130 Gunship Description: Be the gunner of an AC-130 Gunship. Your screen changes to the gunners view and the AC-130 will fly around the map. You have 40 seconds to use the 25mm, 45mm and 105mm guns to shoot at enemies, but you can also take down enemy helicopters and harriers.
Enemies that don't have the Cold-Blooded perk will appear with a red box around them. You are vulnerable while controlling the AC-130, but if you get killed on the ground, you can still continue your session.
The AC-130 can only be shot down with missiles, but it has 2 sets of flares as countermeasures, so the first 2 missiles won't hit it.
# 15 Kills
EMP
EMP Description: The electromagnetic pulse (EMP) temporarily disables enemy electronics for 60 seconds. It also stops the enemy from calling in killstreaks, and at the same time drops down any helicopters and aircrafts that are in the air.
The EMP also has the following effects on the enemy:
* Removes the heads-up display, HUD.
* Disables electronic sights.
Red Dot Sight, Holographic Sight, Thermal Scope etc.
* Heartbeat Sensors won't work.
* Disables Sentry Guns.
# 25 Kills
Tactical Nuke
Tactical Nuke Description: Calls in a nuclear strike that kills everyone on the map. It gives you and your team an instant win.
Once activated, nothing can stop it.
[multipage=.Deathstreaks]
Deathstreaks
Death Streaks are the opposite of Killstreaks, they are meant for players who are constantly getting killed. Once you've died enough times, without any kills, your Death Streak will become active.
# 3 Deaths
Painkiller
Painkiller Description: Works almost like the Juggernaut perk from Call of Duty 4. After you respawn, this gives you twice the amount health for 10 seconds. This can prevent most one-hit kills.
Unlocked at level 6.
# 4 Deaths
Copycat
Copycat Description: Allows you to steal your killer's class. This can give a sneak-peak at the more advanced weapons, attachments and perks, before you've unlocked them. Note: You still need to unlock the everything on your own.
Unlocked at level 4.
Martyrdom
Martyrdom Description: Drop a live grenade just after dying. Like in Call of Duty 4, this is useful in rooms where it's difficult for the enemy to run away from the explosion.
After you kill someone and you hear a grenade drop, RUN!
Unlocked at level 27.
Final Stand
Final Stand Description: Just like the Last Stand perk, but with more improvements. Basically this allows you to survive a normal death. You can crawl around on the ground and use your primary weapon and equipment.
You have a little more health than in Last Stand and if you survive long enough, you can get back up and continue to fight normally. This does not reset your ongoing killstreak.
Unlocked at level 39.
[multipage=Maps]
Maps
Afghan
Afghan Medium sized open desert. Intense Demolition battles.
Derail
Derail Trainwreck in a large snowy area. Epic large battles.
Estate
Estate Cabin in the woods. Fight for control of the cabin.
Favela
Favela Alleyways of Brazil. Great for all game modes and all sizes.
Highrise
Highrise Rooftop skyscraper. Hectic Domination games.
Invasion
Invasion City in the desert. Classic street to street firefights.
Karachi
Karachi Ravaged desert town. Tactical street fights abound.
Quarry
Quarry Medium-sized quarry. Intense Capture the Flag matches.
Rundown
Rundown Village in Brazil. Fight from all angles.
Rust
Rust Tiny desert sandstorm. Fast-paced action on a small map.
Scrapyard
Scrapyard Small airplane graveyard. Great for any number of players.
Skidrow
Skidrow Urban city fighting. In and out of apartments close range engagements.
Sub Base
Sub Base Snowy submarine base. Great vertical gameplay.
Terminal
Terminal Medium-sized airport. Great for all game modes.
Underpass
Underpass Rainy underpass. Good balance of medium to long range fighting.
Wasteland
Wasteland Chernobyl in the open. Great for snipers and long range firefights.
Stimulus:
Bailout:
Overun apartment complex. Long sight lines with great flank routes.
Crash:
Downed Sea Knight in a desert town. Fantastic for team games.
Overgrown:
Large overgrown rural Russian area. Sniper ghillie suits make for good cover.
Salvage:
A snow-covered junkyard. Lots of fast paced action.
Storm:
Stormy warehouse district. Great for intense team battles.
[multipage=Game Modes]
Game Modes
Originally posted by another user
Team Deathmatch
Use teamwork to kill enemy players and reach the score limit.
Team Deathmatch
Use teamwork to kill enemy players and reach the score limit. No parties, random teams.
Free For All
Every man for himself. Kill everyone.
Capture The Flag
Bring the enemy flag to your team's base while your flag is there to score points.
Search & Destroy
No respawing. Defend and Destroy the objective.
Demolition
Attackers must destroy the 2 bomb sites within the time limit. Defenders must keep one bomb site intact by the end of the time limit.
Domination
3 flags must be captured. Your team gets points for having control of a flag. The more your team hols, the more points gained.
Ground War
Big team games of either Team Deathmatch or Domination.
Sabotage
Grab the neautral bomb and plant it on the opposing team bomb site. First to detonate wins!
Headquarters Pro
A target HQ is marked and activates in 30 seconds. Capture and defend them. More points, the longer you hold it.
Team Tactical
Small based team games with Team Deathmatch, Domination, Capture the Flag,Demolition and Search and Destroy.
3rd Person
3rd person view instead of 1st, Team Tactical only game mode available.
Hardcore
A variety of team games just in hardcore which means; limited HUD, extra bullet damage and friendly fire enabled. Game modes available in hardcore: Team Deathmatch, Search and Destroy and Headquarters.
Mosh Pit
Mixed bag of many games in one playlist.
[multipage=Updates]
Updates
Well thank you very much for looking at my thread, I hope it was beneficial.
Images, more description and more pages coming soon! =D
Edit: More description added to the attachments page and image added to the entry page