The Nintendo 3DS will top three million unit sales in Japan by the end of the year and is expected to top four million come April 2012, Nintendo president Satoru Iwata has said.

Speaking to Nikkei (translated by Andriasang), Iwata spoke positively about the 3DS, stating the platform "has regained its vigour" in no small part because of the aggressive price cut and new game releases including Mario Kart 7.

The latest instalment in the hit racing series sold 420,000 copies during its first week on sale in Japan - that's double the figure achieved by the DS version in its first week.

In the UK there has been reports of increased demand for the 3DS, with the handheld coming close to selling out.

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