Is Call of Duty Black Ops 3 online only? Bo3 is not a multiplayer/online only game. It has a great campaign *this is just a personal opinion*and you can make a custom multiplayer game where you play with a few friends or you can practice against bots. Hope this helps you out.

For you, Treyarch has decided to LOCK the entirety of the Multiplayer/Zombies experience offline so you can't even play it splitscreen if the internet goes down.