siebensus4 on 29 July 2017
According to VGC it's the 4th Million seller in Japan for Wii U.
#1 Splatoon (1.54)
#2 Mario Kart 8 (1.34)
#3 New Super Mario Bros. U (1.29)
#4 Super Mario Maker (0.99) (as of June 11th)
The next ones would be
Super Smash Bros. for Wii U (0.84)
Wii Party U (0.84)
Super Mario 3D World (0.75)
I think we won't see another Million seller on Wii U. The highest selling Wii U title in Japan is Zelda BOTW, which has sold 2'003 copies the week of June 11th and only 0.13 Million copies in total, by the way.
