Extinction

Extinction is a game mode featured in Call of Duty: Ghosts. In the vanilla game, the mode was listed as "Extinction", however it has since been renamed in the menus to "Alien Extinction". The game mode features up to four players fighting Cryptids (enemies similar to aliens) in a post-apocalyptic world. Players have objectives, which are to destroy cryptid Hives and complete Challenges. Players also earn money by killing cryptids, destroying Hives or searching Search Piles. The money earned from these can be used to purchase additional guns placed through out the map (similar to Zombies) and use abilities selected pre-game.

The Traps that can be used against the cryptids are the electrical fences and fire traps. The traps cost money to set and only last for a short period of time. The traps do not have a cooldown time and can be used as often as the player wants provided they have the money needed.

There are four classes for the player to choose from, Weapon Specialist, Tank, Engineer, and Medic. For each class there is a specific set of unique abilities/perks that the player will be able to utilize for themselves or their team. There are also loadout slots that players can choose different options from including: Pistol, Ammo Type, Team Support, Strike Package and Equalizer, the player also passively has On the Go and Resilience. Once the player completes level thirty, they will automatically prestige, allowing them to equip an additional Relic, once per prestige. The mode is not infinite round based like Zombies but has an ending and is much more linear.

If a player receives enough damage they will fall to the ground (frequently referred to as "down", due to its similarity to the same action in Zombies). During this period of time the player still has the option of using their secondary weapon. However, another teammate must revive the fallen teammate or they will bleed out and die. When a player dies they will be in spectate mode and a dog tag will appear where their body was located. Nevertheless, it is still possible for another player to revive the dead player at their dog tag. In solo, at the start of the game, the player can be downed once and revive themselves after a couple of seconds, but next time they will directly die. However, when a barrier hive is destroyed or the player proceeds to the next section of the map, the player receives an extra chance; this means that the player can be downed a maximum of three times in a single game before dying.

An update patch on March 4, 2014 now includes a difficulty setting:

Casual: The number of Cryptids that appear are reduced by 50%, their health is also reduced by 50% (Scouts can now be killed with a single melee attack; Rhinos only take up to a single LMG magazine to be taken down). Cryptids are not as aggressive as before the patch, players will take less damage as a result. Players also spend less money by having to use their abilities less often (the prices are still the same, it's the frequency of using them to resupply/re-armor that allows players a full bank most of the time in this difficulty). Playing on Casual, however, does not count towards leaderboard placings; scores won't be posted, escapes will not count. But, the number of Cryptids the players kill will still count towards the 10,000-weapon-kill operation and still earn the Multiplayer patch. Additionally, escaping while using a Relic will also still count towards the background challenges.

Regular: This difficulty is essentially the way the mode has been played before the patch.

Hardcore: The crosshairs on the player's HUD is removed, the Cryptids are more aggresive and skill points are not earned for destroying hives.

An update patch on April 3, 2014 now includes a teeth upgrade system.

Money System
The maximum amount of money a player can carry is $6000 ($3000 with the Smaller Wallet Relic, $8000 with the +4 Engineer upgrade or $4000 with both). The player will receive money after a Hive is destroyed, based on their score earned while it was being destroyed. A supply drop of $3000 ($2250 with Smaller Wallet Relic) will be dropped after a Barrier Hive is destroyed. Also, a $2,000 supply drop will spawn in after the first breeder is killed in Nightfall.

Positive multipliers:
 * 1.5x: Killed with a critical hit
 * 1.5x: Killed with melee

Negative multipliers:
 * 0.75x: Smaller Wallet Relic
 * 0.5x: Killed with a hit to the armor (Does not apply with Armor Piercing Ammo)
 * 0.5x: Assisted kill

Maps

 * Point of Contact
 * Nightfall
 * Mayday

Enemies

 * Scout
 * Hunter
 * Scorpion
 * Seeker
 * Rhino
 * Leper
 * Phantom
 * Breeder
 * Seeder
 * Kraken

Ranks

 * Rank 1 - Weapon Specialist, P226, Normal Ammo, Team Explosives, I.M.S., Portable Turret
 * Rank 2 - Stun Ammo
 * Rank 3 - Tank, Multiplayer Background
 * Rank 4 - Feral Instincts
 * Rank 5 - Engineer
 * Rank 6 - Grenade Turret
 * Rank 7 - .44 Magnum
 * Rank 8 - Armor
 * Rank 9 - Mortar Strike
 * Rank 10 - Medic
 * Rank 11 - Multiplayer Background
 * Rank 12 - Incendiary Ammo
 * Rank 13 - M9A1
 * Rank 14 - Team Booster
 * Rank 15 - Crowd Control
 * Rank 16 - MP-443 Grach, Multiplayer Background
 * Rank 17 - Random Supplies
 * Rank 18 - Trinity Rocket
 * Rank 19 - Multiplayer Patch
 * Rank 20 - Explosive Ammo, Multiplayer Background
 * Rank 21 - Multiplayer Background
 * Rank 22 - Sentry Gun
 * Rank 23 - MK32 Launcher
 * Rank 24 - Multiplayer Patch
 * Rank 25 - Armor-Piercing Ammo
 * Rank 26 - Multiplayer Background
 * Rank 27 - Multiplayer Patch
 * Rank 28 - Vulture
 * Rank 29 - Death Machine
 * Rank 30 - N/A
 * Prestige 1, Rank 1 - 1st Relic Slot
 * Prestige 2, Rank 1 - 2nd Relic Slot
 * Prestige 3, Rank 1 - 3rd Relic Slot
 * Prestige 4, Rank 1 - 4th Relic Slot
 * Prestige 5, Rank 1 - 5th Relic Slot, Multiplayer Patch
 * Prestige 6 - N/A
 * Prestige 7 - N/A
 * Prestige 8 - N/A
 * Prestige 9 - N/A
 * Prestige 10 - N/A

Point of Contact Achievements/Trophies
No Man Left (20 / Bronze Trophy ) - Escape with all four players in Regular or Hardcore difficulty.

Sprinter (20 / Bronze Trophy ) - Reach the exfil chopper with 1 minute and 30 seconds or more remaining on the clock in Regular or Hardcore difficulty.

Made it Out Alive (20 / Bronze Trophy ) - Escape 1st time in Regular or Hardcore difficulty.

Completionist (25 / Bronze Trophy ) - Complete all Extinction challenges and escape.

Cabin Fever (10 / Bronze Trophy ) - Make it to the cabin.

City Dweller (20 / Bronze Trophy ) - Make it to the city.

Any Means necessary (40 / Bronze Trophy ) - Get 50 kills with the electric fence and fire traps in a single game.

Trash Picker (20 / Bronze Trophy ) - Scavenge 40 items in a single game.

Throttled Escape (10 / Gold Trophy ) - Escape using a relic.

Nightfall Achievements/Trophies
Pushing Ahead (20 / Bronze Trophy ) - Gain access to the Compound area in Nightfall.

Weapon Facility (20 / Bronze Trophy ) - Gain access to the Facility in Nightfall.

Survived Nightfall (20 / Bronze Trophy ) - Kill the Breeder for the first time in Nightfall.

Speed Slayer (20 / Bronze Trophy ) - Kill the Breeder in less than 5 minutes in Nightfall.

Turnabout is Fair Play (20 / Bronze Trophy ) - Kill 50 Cryptids with the Venom-X weapon in Nightfall.

Nightfall Completionist (30 / Silver Trophy ) - Complete all challenges and kill the Breeder in Nightfall.

Throttled Survival (30 / Silver Trophy  ) - Kill the Breeder while using a Relic in Nightfall.

Phantom Exterminator  (20 / Bronze Trophy ) - Kill 5 Phantoms in one game.

Pea Shooter  (20 / Bronze Trophy ) - Kill a Rhino with only a pistol in Nightfall.

Undiscovered Truths (30 / Bronze Trophy ) - Found all intel.

Mayday Achievements/Trophies
The Belly of the Beast (20 / Bronze Trophy ) -

Story
Main Article: Extinction (mode)/Story