Never heard the term "couch co-op" before, but I presume it means local co-op. If so, then yes, I think you can. --- The Official Almaz von Almandine Adamant of the Disgaea 4 Board "****ing blocks...I'm gonna climb the **** outta you!"
i actually just heard it for the first time myself when i saw a diablo 3 promotion for ps3/xbox. cute saying. cant believe i never heard of it before. maybe its a regional thing? --- ~I will floss my teeth with your soul~
You can't Co-Op the Prequel levels in story mode, though you can do it in Free Play. Aside from those two specific levels the entire rest of the game can be played Couch Co-Op. You can unlock everything as well, though getting S rank on stages may be a little difficult since you're splitting kills with co-op. --- "I just came out of a PIE, you swooning harpy! That is totally bat-**** insane!" - Mehrunes Dagon