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My guestimate is that Halo 3 will outsell Super Mario Galaxy in North America, while Super Mario Galaxy will outsell Halo 3 in Japan and the rest of the world. The end result will be Super Mario Galaxy outselling Halo 3 but because Super Mario Galaxy will slowly build up its sales, and Halo 3 sold most of its units early on, we won't see it take the lead until late 2008.