Sold nearly 1.5 million units in the month of December - the most single month sales of a system since sales started being tracked in 1997.
http://mynintendonews.com/2012/01/06/the-nintendo-3ds-broke-the-japanese-record-for-most-hardware-sold-in-a-month/
--
http://www.backloggery.com/myimmortal