Call of Duty Ghosts How to Unlock Extinction Mode

Call of Duty: Ghosts introduces a brand new mode called Extinction, also known as Alien mode. In order to unlock Extinction mode you have to complete one Single Player Campaign. Do the following steps and new CO-OP game mode will be available from the main menu.

1. Complete the first Campaign.
2. Return to the main menu and Extinction Mode will be available as one of options.