First WiiU game to reach 5 million in sales?

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DialgaMarine said:
A game selling almost as much as the console as a whole? Might be a bit difficult, but I'm gonna say NSMBU or SM3DW. Both have legs, but NSMBU has a headstart. If neither of those, then definitely SSB4 if it starts to get more attention.

Wii U isn't just going to stop at 5 million, you know.