UPDATE – 28/10/13 @ 18.30: Activision have officially confirmed the mode by releasing a trailer on the official Youtube channel. This trailer shows off the gameplay you should expect to find in the new mode. We have the video below for your viewing pleasure:

Call of Duty: Ghosts introduces Extinction – an all-new 1-4 player cooperative game mode featuring a unique blend of fast-paced survival action, FPS base defense, scavenging and class leveling.

ORIGINAL – 27/10/13 @ 21:46: A gamer who got their hands on an Xbox 360 copy of Call of Duty: Ghosts early began to play through the campaign, but discovered that after passing a certain point (claimed to be 5 missions), a secret mode in the game was unlocked… EXTINCTION. This appears to be a mode inspired by the hugely popular ‘zombies’ mode in the Treyarch iterations of Call of Duty, but with some unique Infinity Ward twists, oh, and aliens.

Extinction was leaked by an online user who got their copy of the game early, and subsequently posted several images online. We will not be posting this images due to them being considerable spoilers of the contents of the game mode, which is quite different to zombies mode. If you wish to see these images, they are very easily found online by simply searching this game mode in Google. The mode focuses on aliens, rather than zombies, and looks very comprehensive and a lot more advanced than the zombies formula, but retaining a lot of the things we love about the mode.

Infinity Ward were ready for the leak, having the teaser video above ready to post. It was uploaded by the team soon after screenshots from the mode were posted online. As big fans of zombies, we are very excited about this extra mode, which we did not expect to be in the game. Bring on November 5th! Stick with us for a review of the game, although it may not arrive until the next gen console launches occur at the end of November. We are currently working out our coverage plans, so, we will keep you updated on our Twitter!