Seece on 13 February 2009
This from the official Microsoft NPD response
"The "Halo Wars" demo, released on February 5, set a day-one record for the most demo downloads on Xbox LIVE; with more than 2 million downloads in the first week, it was one of the top demo downloads of all time on the service"
2 million on the first week, considering only Gold subscirbers could download it only means even more millions of people will download the demo before its release.
With the overwhelming positive vibes its getting, surely this demo will do wonders for the game?
