I read that on dec 11th the halo 3 map pack will be on xbox marketplace. Im not familiar with downloading maps for halo...what i did read was that halo 2 maps were brought in and it divided the online players into 2 sections...1 group who had the maps and 2 the people without...My questions are, with this map pack coming out will i have to download it to make it a playable map in matchmaking?? Will these maps only be in custom? If i but the pack and my friend doesnt, can he play them with me?? How does this work? PLEASE BE DETAILED!! THANX!!