New Super Mario Bros. Wii maintained its launch momentum in Japan, going on to become a phenomenal hit and selling over 3 million copies in seven weeks. Famitsu reports that Mario's latest adventure is the third Wii title to sell over three million units. Ironically, the club of top-selling Wii games has Mario's tubby physique in the company of Wii Sports and Wii Fit. Mario isn't doing badly in other regions, either, with NSMBW recently surpassing 2.5 million units in Europe and 4 million in the States. Mario knows how to make coin. [Via Andriasang]