For me, everything that was in CEA, only I want the multiplayer to be halo 2's.
It would be cool to have more firefight maps, too.
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For the game to be purely a graphically updated port with no changes, and with it's own original stand-alone multiplayer and not a Halo 4/5/6 add-on like we saw with Halo 1 and Reach Anniversary multiplayer. Oh, one can dream... but we all know that won't ever happen. Oh well. I'll be happy to play the Campaign on Xbox 360 with achievements, to be honest.