Title says it all. Feel free to explain why, i'm in a discussion mood.
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Halo Reach. It's the only Halo I have on Xbox One. I had the digital versions of 3 and ODST, but they aren't backwards compatible. I'll have to buy mcc, which I'm planning on because 1) Halo is -blam!-ing awsome, 2) I've never played Halo 2 and it's the only game in the series I've not beaten on Legendary