Survival Mode

Survival Mode is a game type on Call of Duty: Modern Warfare: Mobilized, and a Special Ops Playlist in Call of Duty: Modern Warfare 3. On Call of Duty: Modern Warfare: Mobilized, it is exclusive to Single Player, while in Call of Duty: Modern Warfare 3, it can be played cooperatively with one other player.

Call of Duty: Modern Warfare: Mobilized
It is only unlocked if the player either uses a cheat code, or beats the campaign on Hardened difficulty. Using a cheat code only temporarily unlocks it, while beating Hardened unlocks it permanently.

There are four maps in Survival. They are:
 * Withstand is in a bombed-out apartment building in Russia. There is debris all around the apartment for the player to take cover behind.
 * Persistence is in a military aircraft hangar somewhere in South America. There are several large supply cases for the player to take cover.
 * Outlast is in a small courtyard in South America. Fallen pillars, gates, and a car are all available for the player's cover.
 * Endure, the final map, is in a war-torn Middle-Eastern town. Debris is littered everywhere for cover.

When the player first unlocks the mode, they will begin with Persistence only, and other maps are progressively unlocked. To unlock a map, the player must survive at least three minutes in the previous map. At the beginning of every game, the player starts out with a USP and three Frag Grenades, but there are three randomly generated weapons that spawn on the ground, and eight seconds are given for the player to gather these weapons, and/or to find cover. The weapons found on the ground change every minute. The weapons that can be found are the M4A1 Red Dot, AN-94, AK-74, P90, MP5, MP7, M40A3, AA-12, M249, and the RPG-7. All of the weapons have a large amount of spare ammunition, and, in the M249's case, it has a 200-round mag, where it would be found in other modes to have a 100-round mag.

There is no Co-op for this mode.

Call of Duty: Modern Warfare 3
"In Survival mode you will fight off waves of increasingly difficult enemies as you earn XP and unlock several types of armories to expand your arsenal and load-out customization along the way."

- Description of Survival Mode in the Survival Mode trailer.

thumb|300px|right|Survival Mode Trailer

Survival Mode appears in Call of Duty: Modern Warfare 3 as a gametype within Spec Ops mode. In Survival Mode, players must fend off waves of A.I controlled enemies on various multiplayer maps. The waves are randomized, yet increasingly difficult, so that in the later stages of the game, players can expect to face multiple Juggernauts, Dogs strapped with C4 and enemy air support simultaneously. There is no means of winning in this game mode, as the waves will continue until the player has lost. Like other Spec Ops missions, co-op is available for this mode, both online or split-screen.

Survival Mode also features a monetary system which allows players to buy items such as air support, sentry guns, weapons, and even friendly NPCs to assist the player throughout the match. Currency is earned by killing enemies and additionally by executing spree kills, headshots and other notable actions.

In addition to their normal regenerating health, players start each match with an armor rating, which will diminish as the player takes damage. New armor and armor upgrades can be purchased at a gear armory.

When a wave is over, players can press the crouch button to start the next wave, or simply wait 30 seconds for the next wave to start automatically. This is to allow players some time to ready themselves between waves or buy support, weapons, perks, weapon attachments, equipment, etc.

Survival Mode also has a ranking system similar to multiplayer. Experience earned within a Survival Mode game is saved, allowing the player purchase improved equipment and weapons as they rank up. The experience is also shared with Mission Mode.

Maps are categorized by four difficulties: Easy, Regular, Hard, and Insane. Four maps are found in each difficulty. In Easy maps, the player spawns with a Five Seven, two Flashbangs, two Frag Grenades, full body armor, and Self Revive. In Regular maps, the player spawns with the same equipment as Easy, except the player wields a USP .45. In the Hard maps, the player spawns with an MP412, two flashbangs, no frag grenades, full body armor, and Self Revive. In the Insane maps, the player spawns with an M16A4 w/ Red Dot Sight, a Five Seven, no grenades, full body armor, and no Self Revive.

Enemies
Note: All of the above ground enemies, except the Juggernauts, Riot Shield Juggernauts, Claymore Experts, Dogs and C4 Dogs drop their listed weapon when they are killed. Riot Shield Juggernauts drop a Riot Shield and Claymore Experts drop a PM-9. Juggernauts and Riot Shield Juggernauts don't drop a PKP Pecheneg or ammo for the PKP Pecheneg upon death.
 * Light troops armed with Model 1887
 * Medium troops armed with MP5
 * Heavy troops armed with AK-47
 * Commando troops armed with ACR 6.8
 * Heavy commando troops armed with FAD
 * Suicide troops armed with USAS-12 and strapped with C4
 * Dogs
 * Dogs strapped with C4
 * Chemical Agents armed with PP90M1 and tanks filled with chemicals
 * Juggernauts armed with a PKP Pecheneg
 * Riot Shield Juggernauts armed with an PKP Pecheneg and a Riot Shield
 * Claymore Experts armed with PM-9 and claymores
 * Little Birds armed with a nose-mounted Minigun

Equipment

 * Refill Bullet Ammo: Refill for $750, unlocked by default

Assault Rifles
All Assault Rifles cost $3000
 * M4A1 unlocked by default.
 * M16A4 unlocked by default. Primary starting weapon on tier 4 maps with Red Dot Sight.
 * SCAR-L unlocked at level 5.
 * ACR 6.8 unlocked at level 14.
 * AK-47 unlocked at level 24.
 * FAD unlocked at level 32
 * G36C unlocked at level 39
 * CM901 unlocked at level 43
 * MK14 unlocked at level 47
 * Type 95 unlocked at level 50

Sub Machine Guns
All Sub-Machine Guns cost $2000
 * MP5 unlocked by default.
 * UMP45 unlocked at level 4
 * MP7 unlocked at level 13
 * PM-9 unlocked at level 23
 * PP90M1 unlocked at level 38
 * P90 unlocked at level 46

Light Machine Guns
All Light Machine Guns cost $7000
 * M60E4 unlocked at level 12
 * PKP Pecheneg unlocked at level 18
 * MK46 unlocked at level 34
 * L86 LSW unlocked at level 41
 * MG36 unlocked at level 48

Shotguns

 * Model 1887 for $2000, unlocked by default.
 * USAS-12 for $2000, unlocked at level 6.
 * SPAS-12 for $2000, unlocked at level 16
 * KSG-12 for $2000, unlocked at level 26
 * Striker for $4000, unlocked at level 33
 * AA-12 for $5000, unlocked at level 44

Sniper Rifles
All Sniper Rifles cost $2000
 * MSR unlocked at level 7
 * Dragunov unlocked at level 16
 * RSASS unlocked at level 29
 * L118A unlocked at level 35
 * AS50 unlocked at level 42
 * Barrett .50cal unlocked at level 49

Handguns
All Handguns cost $250
 * Five Seven unlocked by default, starting weapon on tier 1 and tier 4 maps.
 * USP. 45 unlocked by default, starting weapon on tier 2 maps.
 * MP412 unlocked at level 2, starting weapon on tier 3 maps
 * Desert Eagle unlocked at level 11
 * .44 Magnum unlocked at level 20
 * P99 unlocked at level 40

Machine Pistols
All Machine Pistols cost $1500
 * G18, unlocked by default
 * Skorpion, unlocked at lvl 3
 * MP9, unlocked at lvl 17
 * FMG9, unlocked at lvl 37

Attachments
Scope Attachments Under-barrel Attachments
 * Holographic Sight for $1000, unlocked by default
 * Red Dot Sight for $750, unlocked at lvl 7
 * ACOG Scope for $1250, unlocked at lvl 30
 * Grip for $750, unlocked at lvl 19
 * Grenade Launcher for $1500, unlocked at lvl 28
 * M203 (Underbarrel, M4A1 and M16A4 only)
 * GP-25 (Underbarrel, AK-47 only)
 * M320 (Underbarrel on most weapons)
 * Shotgun for $1500, unlocked at lvl 45

Maps
Tier 1 (Easy) - unlocked by default Tier 2 (Regular) - unlocked at lvl 8 Tier 3 (Hard) - unlocked at lvl 15 Tier 4 (Insane) - unlocked at lvl 25
 * Resistance
 * Village
 * Interchange
 * Underground
 * Dome
 * Mission
 * Seatown
 * Carbon
 * Bootleg
 * Hardhat
 * Fallen
 * Outpost
 * Lockdown
 * Arkaden
 * Downturn
 * Bakaara

Equipment Armory

 * Frag Grenade Refill for $750, unlocked by default
 * Flashbang Refill for $1000, unlocked by default
 * Claymore x5 for $1000 (10 Max), unlocked at lvl 2
 * C4 x5 for $1500 (10 Max), unlocked at lvl 3
 * RPG-7 x2 for $2000 (4 Max), unlocked at lvl 27
 * Sentry Gun for $3000, unlocked at lvl 17
 * Sentry Grenade Launcher for $4000, unlocked at lvl 31
 * Body Armor for $2000, unlocked at lvl 10
 * Self Revive for $4000, unlocked at lvl 12
 * Riot Shield for $3000, unlocked at lvl 37

Air Support Armory

 * Predator Missile for $2500
 * Air Strike for $2500, unlocked at lvl 4
 * Delta Squad for $3000, unlocked at lvl 14
 * Riot Shield Squad for $5000, unlocked at lvl 21
 * Perk Care Package
 * Quickdraw for $3000, unlocked by default
 * Steady Aim for $3000, unlocked at lvl 8
 * Stalker for $4000, unlocked at lvl 22
 * Extreme Conditioning for $4000, unlocked at lvl 36
 * Sleight of Hand for $5000, unlocked at lvl 50