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I have and they say that 100 or 1000 people from microsoft tested halo2 on xbox live and got to try 3 multiplayer levels. There are also some new screens.
There was 1000 microsoft employees with the HALO 2 demo with three playable levels: waterworks, lockout, and burial mounds. Waterworks looks like an awesome map.
u can also do a boost with the ghost or banshee
Oh, i forgot, those are the names. Ya, waterworks looks amazing, huge and tons of vehicles,lockout is also cool for quick action