Play through the campaign levels on normal and you will be able to unlock them. The one firefight character you will not be able to unlock is Sgt. Johnson. In order to unlock him you will need to pre-order Halo 3 ODST.
No, It does not. Halo ODST is the story of a squad in New Mombasa before/during the events of Halo 3
in HALO 3 you are a Spartan and in HALO 3 ODST you are a Orbital Drop Strike Trooper (ODST)
Classic would just be old Halo 3 maps instead of the new ones that came with ODST.
A city in Africa on earth called New Mombosa
Yes halo 3 ODST does have swearing in it but the swearing isn't that bad meaning the characters in ODST don't swear that much.
I would say Halo 3 ODST
Halo 3 ODST is not for PC but Halo 1 and maybe Halo 2-3 are
there will be new vidmasters for odst, but halo 3's vidmasters will remain the same.
Halo 3: ODST is the newest of the two, but not the newest Halo game.
halo 3 odst, unlike halo 3, has no matchmaking, sorry
After Halo 3 was finished by many gamers Bungie began making new games to go on the side of the Halo story line. Halo 3 ODST and Halo Wars were both being developed at the same time but Halo ODST was released first
No.