That makes it the best selling Wii game for the period, right? Nope! That's Mario Kart Wii, which sold 4.91 million copies between April and December, for a life-to-date total of 31.91 million copies. New releases Kirby's Return to Dreamland and Wii Play Motion squeaked into the million-seller club with 1.21 million and 1.12 million respectively.
On 3DS, Super Mario 3D Land sold 5.03 million in total -- 3.68 million "overseas" and 1.36 million in Japan. Mario Kart 7 sold almost as many, at 4.54 million. Even the good old DS managed to have some million-selling new releases: Professor Layton and the Last Specter (1.19 million, all outside of Japan) and Kirby Mass Attack (1.01 million).