That’s right, Resistance 3 will be including two-player co-operative campaign that you and your buddies can play online or in split-screen. Lead designer Drew Murray had this to say to Play Magazine:
“We had a very vocal group speak up when we didn’t have campaign co-op in Resistance 2, and there is something very special and unique about playing back-to-back with your buddy through the campaign, There will be several unique co-operative mechanics to allow you to assist and rescue your co-operative partner that won’t exist in the single-player campaign.”