Resident Evil 6
Capcom has often tried to offer multiplayer options with its Resident Evil games. With Resident Evil 6, people got some of the most advanced versions of these experiences. The campaign allowed you to go through two player and, in some instances four player, co-op. You could also have up to six people going through Mercenaries maps in Predator, Siege, and Survivor modes that had you working with and against one another. It was not only competent, but also fun.