Was there I was just wondering was there more missions planned then 10?
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I know a few levels were cut out in Halo 2 (according to the Halo 3 Legendary edition disc). In Halo: CE there was a change to the original objective of "The Silent Cartographer", where the Chief had to assassinate the Prophet in religous command of the Fleet of Particular Justice as well as retrieving the cartographer of Halo.