I know this isn't the halo 3 board but maybe someone can help me. I got a copy of h3 from a friend but I can't play online. It says that I need to download maps but not where or how. So my question is, is it still possible to do this?
yes it is, go to the dashboard, go under your games, select halo 3. go over to dlc and download all of them. they should all be free (heroic, legendary, and mythic) except for mythic 2 which is 800 points.
alternatively if you get a copy of halo odst it comes with a multiplayer disc containing all the halo 3 dlc. since that costs about 15-20 bucks you are spending about 5-10 dollars more for all the map packs, but save a lot of time since you do not have to download anything.
i would recommend the second one, odst actually is a decently fun game and it will save you so much hard drive space.