D-Joe on 25 January 2013
I think it's not that hard to go official site
http://www.halowaypoint.com/en-us/games/halo3/overview
Halo 3 is the concluding chapter in the Halo trilogy—an international award-winning action series that grew into a global entertainment phenomenon, selling more than 14.5 million games worldwide, logging more than 650 million hours of multiplayer action on Xbox LIVE.
