We are little over a week away from the release of Ghosts and more and more copies are appearing in the wild. One rumored mode that we know little about is Extinction, but a player who got their hands on an early copy has leaked the details. It seems like Extinction at its core is much like Treyarch's Zombies mode, but with aliens. From what we know you must complete an unspecified amount of the campaign before you can play this mode. That is where the similarities end and Extinction takes on its own life. Not only will you have to kill a specific amount of aliens, but you will also have to complete mission or objectives, just like recent Zombies maps.