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I was wondering is there any way I can install the maps from the Halo 3 ODST multiplayer disc to Halo 3 so I can just use my Halo 3 disc for campaign and multiplayer?[Edited on 08.09.2011 5:39 PM PDT]
"I may not be perfect, but always been true."
Nope, it is impossible.
Nope, the only way is to just buy all the Map Packs from the Marketplace and play it via Halo 3's Original Disk.