I'm not sure if Mario Kart can do it. it's at what, 11.5 mil? so thats 8.5 mil to go selling roughly 65k / week would take 31 months, knocking off 5 months for holiday boosts could take it just a little over 2 years. Nintendogs a definite 20 mil, NSMB a definite, Brain training 1 probably, not sure about 2.
So New Super Mario Bros will be the first game ever to sell 20 million units without being bundled or having multiple versions.







