- Zaltyre
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- Exalted Legendary Member
No. You can only use the DLC maps (from the mythic disk) when the Mythic disk is in, even if it's installed. Even though they both show up as "Halo 3," your xbox recognizes that Halo 3 and the Mythic disk are different things. Also, installing Halo 3 will not let you play campaign from the mythic disk.