Mario Kart Wii also manages to sneak in another million
http://www.nintendoworldreport.com/news/36438
Five titles in the Wii U's library have surpassed the million-sales mark worldwide.
Following tonight's investor presentation, Nintendo released sales data for its top-selling Wii U titles. Super Mario 3D World came in first place, with over 1.94 million units sold. New Super Mario Bros. U came in second with 1.74 million, followed by New Super Luigi U with 1.51 million, Wii Party U with 1.24 million, and The Legend of Zelda: Wind Waker HD with 1.15 million.
Additionally, Mario Kart Wii managed to sell another million units in 2013, despite its release on the Wii nearly six years ago.