"Capcom Co., Ltd. (Capcom) is pleased to announce that shipments of its "Monster Hunter 4" game for Nintendo 3DS™ in Japan have exceeded four million units, including sales of the downloadable version through download cards and the Nintendo eShop." - http://www.capcom.co.jp/ir/english/news/html/e131204.html
"As of last week, Monster Hunter 4 had sold 3 million copies at retail. Download sales have no doubt pushed that number considerably higher, but it’s hard to say by just how much.
That said, Capcom must be expecting big things from Monster Hunter 4 this Christmas and New Year’s if there are now 4 million copies of the game out in the wild. It should be very interesting to see how the game performs through its first holiday season.
Meanwhile, Capcom say they intend to continue promotional activities of Monster Hunter 4 in Japan in order to generate even more interest in the game. Monster Hunter 4 was released in Japan on September 14th."
- http://www.siliconera.com/2013/12/03/monster-hunter-4-moved-4-million-copies-japan/