Around 2m copies of Mario Kart 8 have been shifted within the game's first month on sale, Nintendo has confirmed.
That figure corresponds to around a third of the Wii U's 6.17m-strong userbase.
The sales data emerged overnight from comments made during Nintendo's AGM and has been subsequently confirmed by the company itself (thanks, IGN).
Last night's AGM was chaired by Nintendo's research boss Genyo Takeda in the absence of company chief Satoru Iwata, who is currently recovering from surgery. A report suggested that Wii U sales had also seen a recent boost - likely from the launch of Mario Kart 8.