If you buy the card from a retailer, such as target, they'll put a receipt on the back that gives you the code. Then come home fire up your Xbox 360, hit the middle button, go all the way to the left and click redeem code and put the 25 digit code in. If you're buying from the marketplace just buy it and vwallah you have the 3 maps.
Well I've downloaded them on bungie.net but they are very very low level mods like, added buildings or towers or bots that dont move, but no weapon mods or anything like that if you own mods like that you are kicked off xboxlive for Halo 3, so just check bungie everyonce in a while, and if you dont have an account make one and link your gamertag to it and you can download maps and varients and other stuff for halo 3.
You might be able to find a game store that sells a CD version that you can download.
no, you must connect to xbox live to download halo 3 map packs.
You can download Anniversary Maps to Halo: Reach but not to Anniversary.
Download the new map packs for codWaw from the Xbox live store, or access the map packs from within the game itself at start-upDownload Map Pack 3 from PlayStation Store if you have a PS3. If you have a Xbox you download it from Xbox live Store.
You can't unlock items, you have to download map packs off of Xbox Live. Like the Heroic map pack, the Legendary map pack and the Mythic map pack.
You have to download it over xbox live
The only way to get map packs is buy xbox live. so yes
go to Marketplace, Game add ons, map packs, browse 'halo'
Download it FREE from the XBOX LIVE Marketplace.
The Heroic Map Pack for Halo 3 is now free. You can download it via xbox live marketplace.
There will be in the new "Cold Blooded" map pack coming out with Halo: Reach. It will include Beaver Dam (remake of beaver creek) congretial (remake of blood gulch) and there will be an add on for Halo 3 odst (Dare's Backstory) on xbox live march 22
xbox live -They are not free buy them like everyone else.
Map packs can be purchased at the PlayStation store or from Xbox 360 download store for $10 or the set of 3 map packs for $25