It's official, Brain Age: Train Your Brain in Minutes a Day is a hit... but mostly in Japan.

The non-game sold more than 4 million copies world wide, but 3 million of that was in Japan. That really says something about the cultural difference of gamers in different countries, even when you factor in the head start Japan got on sales.

It also shows that the world's gamers, and some non-gamers, are open to the concept of games that aren't just about traditional forms of play. Let's hope some of the other big companies take notice of that. Brian Crecente