With that magical feature called Forge.
go to the forge sign in the title screen
The bigger maps. Go to forge and check and it will let you place a warhog if so.
If you install it onto your harddrive and insert the original halo 3 disk you can access the three extra maps and the matchmaking features.
No you don't , Halo :ODST is a stand alone game that has 2 disks : 1- ODST story mood and a multiplayer mood called firefight 2-A disk that has all the Halo 3 multiplayer maps that you can play WITHOUT the need to have the original Halo 3
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.
No. ODST doesn't have multiplayer, excluding firefight (which can't be forged, and not even for matchmaking) and co-op campaign. But ODST does come with a Halo 3 multiplayer disc, which includes all of the original multiplayer maps and the DLC maps. That disc also includes forge mode.
You must buy Halo 3: ODST and the game will come with two discs. One for campaign and the other for multiplayer games like matchmaking, custom games, and Forge. The multiplayer disc is the same thing as Halo 3 but upgraded to Halo 3 Mythic and you will automatically have all the mythic maps.
You get the Halo 3 ODST campaign and Halo 3 multiplayer. Nothing else.
if you mean to "unlock" them...no. You have to purchase and download those maps. They simply arent on the game disc and need to be installed on the hard drive. You also could buy ODST, and that includes a second game disc that has everything Halo 3: Multiplayer on it.<-----thats they best deal, plus you get Halo: Reach multiplayer beta
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. =)