Legend11 on 20 September 2007
Burning Crusade sold 2.7 million Worldwide in 24 hours, the odds of Halo 3 beating that are pretty slim (especially since Burning Crusade was released in U.S., Europe, and Australia on the same day) but even if it comes close it's still an achievement considering the base price for Halo 3 is $20 more than Burning Crusade.
(It's hard to figure out Pokemon Diamond and Pokemon Pearl because they were released in 2006 in Japan, and in different months in 2007 for U.S. and Europe... Plus their numbers always seem to be combined).
