We have a thread with PS4, so, i wanna make a thread for Wii U.
http://gamrconnect.vgchartz.com/thread.php?id=204728&page=1
That said, i will go with 4.
- Mario Kart 8 (already millionseller)
- Super Mario Bros U (already millionseller)
- Super Smash Bros U ( Little under 700k currently )
- Splatoon ( Little under 400k currently )