Available for free exclusively on Xbox LIVE Marketplace, each map presents a totally different play style. Standoff’s symmetrical valley, with its entrenched bases and fields of boulders is ideal for mid-sized objective and Slayer game types, while Rat’s Nest’s vast, labyrinthine passages bring something new to the “Halo” multiplayer experience: an indoor vehicle paradise, strongly influenced by the Campaign mode, ideal for big team battles. Finally, Foundry is the ultimate Forge map – players can edit every single object in this voluminous industrial warehouse, place stairways, walls, bridges and tunnels to create an entirely new play space and build almost any kind of map they can think of.

As if the legions of "Halo 3" players needed more reasons to stay logged on and fragging, the Forge also allows players to edit and customize all three maps, keeping “Halo 3’s” multiplayer experience fresh, exciting and evolving. In addition, ongoing updates to “Halo 3’s” matchmaking playlists ensure that ranked and social gameplay remains dynamic and competitive.