Man, that number -- nine games over ten million -- is just mind-boggling.
I'm going to say:
New Super Mario Bros. U
Nintendo Land
Super Smash Bros.
Mario Kart
Wii Fit U
Wii Sports U
I'm a little bearish on the 3D Mario. So I will leave it out. But six ten-million sellers is still amazing. If I had to pick a dark horse, it would be another Donkey Kong Country game.