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for the sort of tutorial level in halo 3 so the player can select the controls there should be a flashback level to reach. the flashback can occur after mastercheif has had a crash landing on earth on the coninent ship.
This is very old, it's a cool idea, but for the majority of Halo fans, it would be far too confusing to put in since they haven't read the books or even go on the forums[Edited on 7/22/2006]