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big difference. first of all they are both different games and ODST doesnt have like team slayer it only has like a survival game mode. you cant play ODST with someone with halo 3
The Halo 3 Mythic Disk that comes with ODST has access to some maps that Halo 3 doesn't, the other half of the Mythic Maps that the disk gets it's name from. Other than being able to use some play lists that Halo 3 can't, the matchmaking systems is identical between the two of them. Basically when you put in the Halo 3 Mythic Disk, you're putting in Halo 3 that's missing the Halo 3 campaign and adding on all of the map packs for the game without having to buy them separately.