In the time where almost every triple A Xbox 360 title got an online co-op option. Halo 3 will only have an offline version of the co-op. The reason for this is a problem with the lag. When players are on opposite ends of the map, the game becomes unstable and players will experience heavy latencies.

It's strange that they don't use the teleport system of Halo 1. When one of the players reached a checkpoint, the other player got instantly teleported towards the other player. Also when you hear a game like Crackdown makes it possible to have players on opposite ends of the map, i do wonder why it won't work with a linear shooter like Halo 3.

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