NintendoPie on 16 June 2013
15 Million at the lowest and 20 Million at the highest.
Mario Kart 7 is tracking ahead of Mario Kart DS and both MKWii and MKDS flew the series into extreme popularity. I don't see how it could fall below the double digits anytime, anymore. Also, Mario Kart 8 will be the biggest game for the Wii U in the Spring, that's for sure.
