The demonstration kicked off with the drop troopers burning through the atmosphere. The game itself begins weeks before the events of Halo 3, with an giant explosion hitting the various drop pods just prior to reaching their destination.
A sound-suppressing weapon and light-sensitive equipment are provided to players. As previously known, players will find clues that hint at the fates of other drop soldiers, which then allow you to travel back in time, as it were, and play from their perspective.
The full game will arrive at retailers worldwide on September 22, with Bungie promising that it will sport a new cooperative mode entitled Firefight.
In addition, those that buy ODST will be provided with multiplayer beta access to Bungie's just-revealed 2010-due Halo entry, Halo: Reach (X360).