The new alien-fightin' mode, Extinction, has you quickly planning out defensive strategies, then fending against hordes of various types of alien assailants as you defend your lone, irreplaceable drill from angry aliens. As you progress, you'll earn points that can be spent on upgrades to customize and level up your character, as well as money that can be spent on useful things such as additional ammo, defensive emplacements, use of existing chain guns as well as to activate environment hazard traps, such as oil drum traps and electric fences, etc. The key to survival in Extinction is to have a game plan and to play on a team that works well together.
Your goal is to work your way through areas infested with aliens, destroying any hives you encounter on your way, then to arm a nuke and run back to where you were dropped off to get back on the helicopter. Piece o' cake, right?
You'll need teamwork and communication to succeed... but I guess that goes without saying for cooperative modes, right?
I have to admit that I was hoping for a newer version of Spec Ops' Cooperative Mode when I got my hands on Ghosts, but while it's not the same game mode that I was hoping for, the inclusion of two different cooperative modes is great.