Play up to 4 players in a new mode in Halo 3: ODST called “Firefight”. You can play on System Link and Xbox Live with friends.
Fight waves and waves of the covenant, Each wave is harder and more squads are dropped on the map. Even vehicles are dropped, so you and your squad has to have a plan.
Every round there is a new skull picked. These skulls are from Halo 3. Watch out these skulls in pack each round in a BIG way.
You have 7 lives for the the first round. Make a plan, and stay alive!