It was all those dirty casuals the Wii brought in 
That might not even be that off the mark, the 3DS sold about half what the NDS did but NSMB2 had a steeper drop off than that from what I can tell in sales momentum.

That might not even be that off the mark, the 3DS sold about half what the NDS did but NSMB2 had a steeper drop off than that from what I can tell in sales momentum.
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