Wii Fit has been a huge success since its release in Japan, but CNet reports that Shigeru Miyamoto is uncertain how the game will do when it’s released in the US due to cultural differences.

Coming off the overwhelming success Wii Fit has already secured in Japan–more than 2 million units have been sold so far–Nintendo is ready to bring the balance board to North America. While Wii Fit has become somewhat of a family sensation in Japan, Miyamoto says he’s not sure how an American audience will receive the game. When we asked Miyamoto what he expected from American consumers, he noted that on average, American families are apart more often than those in Japan. A lot of families have parents who have separated or divorced, so it’s tougher to predict the role family will play in the American response to Wii Fit.

With that said, though, Miyamoto did sugggest that there is potential for the Wii Fit balance board to be used in other games, including those made by third party developers. Additionally, he hinted that the game may be connected with the Nintendo DS.