Mario Kart was beaten by Super Smash Bros when it sold just under 8.43 million units .
Mario Kart 8 , released for the Wii U , has shipped 1.2 million copies in North America and Europe combined on its first few days since launch , which was the console 's fastest-selling game until the record was beaten by Super Smash Bros. for Wii U . It sold a total of 8.44 million copies and is the Wii U 's best-selling game .
Mario Kart