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
No - because there isn't a Halo 3 ODST multiplayer mode (there is a separate disk that contains all of Halo 3 multiplayer maps) but as for the actual game, the only multiplayer mode is firefight. In firefight you fight against AI (Covenant) enemies with your friends, so there isn't forge.
You get the Halo 3 ODST campaign and Halo 3 multiplayer. Nothing else.
yes of course they do
yes only multiplayer has the new map packs but you can get them in the DLC
you can get all of the skulls on multiplayer. =)
yes ,if you pre-ordered the ame and got the halo 3 full multiplayer expireance if u use that disc
There is no money.
you have to have odst and it comes with an halo 3 mythic multiplayer disk and you get it with that
Yes.
Falcons? The Falcons on Halo: Reach? No, no it does not.
Yes and no The achievements will be counted the same and so will the disks but if you have the ODST multiplayer disc (Halo 3 Mythic) and you join someone's campaighn on regular Halo 3 it won't work same thing if someone on HAlo 3 regular joins a map that comes with ODST for example SandBox.
There is multiplayer in halo 4