The audience was then split in half and a champion selected for each side. The winner could secure a copy of Halo 3 for everyone in their half of the audience.
Unfortunately the battle was disrupted by technical problems, at which point Microsoft offered a copy of the game to everyone in the audience.
Further problems marred the launch of the final part of the Halo trilogy, following reports that some Halo 3 Limited Edition discs were scratched rendering the game unplayable.
Microsoft has acknowledged the problem and promised to replace any scratched Halo 3 disc free of charge until the end of the year.
Those affected will need to return the disc along with a form which can be printed out from Microsoft's Xbox Disc Replacement Program website, but customers have been warned to allow up two weeks for delivery of the replacement.
Worldwide pre-orders for Halo 3 reached around 1.5 million, and Microsoft expects sales to top £70m in the first day alone.
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