Bungie’s Halo 3: ODST sold 2.5 million copies in its first two weeks.
USA Today reports that overall sales reached $125 million in revenue so far. “That’s pretty good for a game that most called an ‘expansion pack,'” said Wedbush analyst Michael Pachter.
The original Halo 3 did $170 M on its first day of business, eventually amounting to $300 million during the first week on sale.
For being a simple expansion pack Bungie and Microsoft have generated huge sales. It seems that anything with HALO in its title is guaranteed to make millions 😉