- Halo 3: ODST contains 1,750 new Xbox LIVE achievement points, as well as new weapons, technology, and an invite to join the Halo: Reach beta in 2010
- Stand-alone expansion to Halo 3 that doesn't require ownership of the previous game to play
- New campaign, hero, and tactics from the Halo universe as players take on the role of a rookie in the Orbital Drop Shock Troopers sent into New Mombasa
- 4-player co-op "Firefight" mode offers a whole new way to play Halo with friends both via system link and over Xbox LIVE
- Along with all the existing Halo 3 maps, ODST contains three new multiplayer Halo 3 maps: Heretic, Longshore, and Citadel
