muythic map pack. that comes with HALO 3: ODST
Forge is not in Halo 2 and comes out in Halo 3 and Reach
you probaly need legendary, cold storage and/or the heroic map pack.
The Halo Odst Disk 2 comes with all maps (Plus 3 extra), and the ordinary halo 3 disk comes with no added map packs, so you don't have another 12 maps.
The map, Foundation, does not exist in Halo 3 and is only available in Halo 2.
Either buy the mythic map pack (worth 800 ms points) or get the multiplayer disc that comes with Halo 3: ODST.
when ODST comes out
Yes, you need Xbox Live to download the Mythic Map Pack and to use the "Honor Guardian Wraith" that comes with the limited edition.
No
Every map in halo 3 is a good map. I perfer guardian or Blackout
Because If you only have The Mythic map pack that comes with halo 3 odst you probly want to play the campaign and you cant
No, the Halo 3 game disk has both the campaign and multiplayer mode on it. What might seen confusing is in Halo: ODST, the game comes with two disks. One disk is for the Halo: ODST game and the second disk is for the Halo 3 multiplayer with all the latest map packs on it such as Mythic