Diablo 3's world of Sanctuary is filled with "more than 10 million" players as of the end of July, according to Activision. The publisher announced as much this afternoon in a quarterly earnings statement, dubbing it the "best-selling PC game for the first six months of 2012." Of note, at least 3.5 million of those copies were sold in the first 24 hours alone. Not too shabby! During a followup conference call, Acti reps noted that approximately 1.2 million of those sales were through the WoW Annual Pass. Blizzard's assuredly hoping for a repeat of that in the later half of 2012 with its World of Warcraft expansion Mists of Pandaria. But hey, competing with yourself for the number one spot sounds like one of those "good problems," if you know what we're saying.