Bungie today confirmed that Halo 3 will not only support online cooperative play, but that it will support up to four simultaneous players in the same game.
The game will support up to four players in Campaign mode on either Xbox Live or System Link, helping you to get through the toughest battles in the game with the assistance of your online buddies. All players in co-op mode will get identical skills when starting out, with the only difference being their looks and what weapons they start out with.
According to Bungie, development of this new mode was a huge technical challenge, and they wanted to wait to be sure they had all the kinks out before officially announcing it. This puts to rest recent speculation that technical problems might have resulted in the removal of co-op play altogether from the highly-anticipated Xbox 360 FPS.
The full details are now up on the Bungie website.