Did you know that almost half of everyone who owns a Wii U also owns Mario Kart 8, according Nintendo sales figures released this week.

Since its release in May 2014, Mario Kart 8 has sold 3.49 million units, as disclosed in Nintendo’s financial results briefing (PDF link). On its investor relations website, Nintendo pegs Wii U sales at 7.29 million units as of Sept. 30, 2014. That sets the attach rate for Mario Kart 8 at 47.87 percent, meaning that nearly half of those who own a Wii U also own the kart racer and giving it the highest attach rate of any Mario Kart game.