Then, complete the 'Chrome Barrel Master' challenge to unlock the Ghillie suit. Repeat this process until the 'Chrome Barrel Master' challenge is active. If it says 'Challenge Inactive', go to 'Operations', and spend one Squad Point to get new challenges. To unlock the Ghillie suit in Multiplayer mode, select 'Weapon Challenges' to see if the 'Chrome Barrel Master' challenge is active. In Extinction mode, four players fight aliens in a post-apocalyptic world.
Alternately, reach Level 5 in Multiplayer mode. Successfully complete Mission 1: Ghost Stories in Campaign mode on any difficulty to unlock Extinction mode at the main menu.
