The universe of Mass Effect expands with the addition of new co-op multiplayer missions, playable over Xbox Live, PSN and PC internet. Here are the exact details mentioned in the forum: 4 player co-op multiplayer Join your friends in the all-out galactic war to take Earth back. It seems the title will now have online co-op multiplayer missions and something called Mass Effect 3: Galaxy at War system. Just hours after the announcement that Mass Effect 3 will have multiplayer, community coordinator Chris Priestly wrote on the Bioware forums describing the new multiplayer feature.
