Quote from the0rthopaedicsurgeonI finished SP earlier, and just finished co-op in about 4.5hrs with a random German. i think it's the best game valve has ever made, i loved
and how even after however many hours it took, it never felt like you were doing the same things over and over.
also, how does co-op with other players work? we checked the hub afterwards, and we both had ticks next to each level, but if you play with someone else, can you only play levels both of you have already completed, or does only one player need to have them unlocked?
You can select whichever level you want once in the hub, whether one of two or both people have played them before. I'm doing my coop run with a friend in the US who had already gone through half of it himself before we started.