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2nd co-op is a separate campaign that plays differently from the main game itself. It's meant to be played online with up to 8 players in a room, but you can play it with 2 people on the same system, as well as 2 people on the same system joining/hosting online.
PSN:LonelyDesperado MissTFayed: rahmed51387 - You got the surfer accent. You are officially the smartest person on here.