Older Halo Games Could Someday Get 4 Player Co-Op
One of the consistent things every Halo game has had is co-op play. And while it simply started as clones of Master Chief running around in 2 player co-op Halo, the game progressed to integrate it into the story with Halo 2 as the Chief and Arbiter were the focus of that campaign. And with four player co-op being added in Halo 3, it changed the benchmark for the series.