halo_3:_odst
A spinoff title in the ]] franchise. Set during the events of Halo 2, the game follows a squad of [[ODSTs dropped into the city of New Mombasa to fight the Covenant invasion.
ODST only featured the campaign and Firefight (a new PvE horde mode that would later be a mainstay in the franchise), and was bundled with a separate disk that contained the multiplayer portion of Halo 3 with all of the post-release DLC instead of a dedicated PvP multiplayer mode.