Halo 3 ODST (Xbox 360 used game)

Disc One: Prepare to drop.
Campaign. The year is 2552. Covenant forces control the city of New Mombasa. They are searching for something beneath its darkened streets. You are an Orbital Drop Shock Trooper. Your orders: Stay alive, meet up with your scattered squad, and escape the embattled city. Stop the Covenant and we just might win this war.

Disc Two: The complete Halo 3 multiplayer experience.
The standalone disc contains the complete Halo 3 Collection - 24 maps in all, including the customizable Sandbox and three brand new maps culminating in Heretic, the highly anticipated return of Halo 2`s Midship.