ninjapirate42 on 06 July 2015
Well we already have Mario Kart 8 and NSMBU.
Wii Party U is over 800K according to this site and Smash U at 700K. I think after the holidays both of these will be lifted over the million marker.
Splatoon will eventually get there. Not quite sure if 3D World will have enough legs in Japan without some bundles, but Mario Maker should be able to I think.
I'll go with 5+.
