Zucas on 04 January 2010
Well fastest game to 10 million is GTA: SA which did it in 9 weeks. When I did that comparison that wasn't taking into account that Japan release came a long time later but I believe it still works out that it crosses the 10 million mark after 9 weeks.
If we do the same for NSMB Wii it doesn't seem unlikely that it will surpass or tie this. 8.20 million in 6 weeks (4 weeks only in Japan) is quite incredible.
Essay Pro