There will be a co-op mode, but there's something odd in that it won't be released with the game. If you buy the game new, you'll get a free one-time code. It's a bit confusing. I also can't find any details about the co-op mode, so I don't know if you should get 1 or 2 copies. At least and definitely 1. First person killed by a squig has to hand over the controller.