Extinction mode in Call of Duty: Ghosts is a new mode that's kind of like if Zombie mode from codblops had a baby with Survival mode in MW3. There are some small requirements in order to unlock it however, which this guide explains.
This is retarded, they should have done a full blown aliens mode like zombies have been done since WAW. This mode seems like they didn't really care about it too much, thus the reason why Zombies still gets played more than anything in my house.
I think it's pretty cool once you get the hang of it. Personally I like that it's different from Zombies and Survival, gotta change it up a bit.
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