Halo Remastered
343 discusses if it’s possible to add 4-player co-op to Halo and Halo 2
It could be done, but it would take an awful lot of work.
Halo Remastered headlines
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Halo: Combat Evolved Anniversary announced for November
Microsoft has announced a remastered version of Halo: Combat Evolved. It will contain co-op, remastered looks. Seven of the most popular multiplayer maps and more.