A lot of you guys on the Wii U's case have to realize that unlike the mario kart Bundle, the splatoon one was not widely available (only in best buy). Splatoon has been very consistent on amazon Japan and this is just 2(3?) days worth of sales and it did very well. You also have to remember that Mario kart did boost the Wii U up very far so of course it would be down. June is where we'll see the full effect of Both splatoon and Mario kart and the availability of the bundle among other things will most likely keep it down. It just has to come close enough to the Mario Kart effect so that the line up for the rest of the year can pull Wii U back ahead which it most certainly can.
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