Why New Super Mario Bros. Wii has sold over 10m units?

[Carl]

nordlead said:

Carl2291 said:
It's a console 2D Mario Platformer released in the holidays just after a pricecut and also advertised majorly.

it would have sold 10m just based on the first half of your sentance. The second half (holidays on) is just why it did it in 8 weeks.

True. Just to clarify... I was answering to this specific line -

"I find it interesting.How has it sold over 10m already?"