cusman on 30 March 2013
The Microsoft Xbox 360 sells most in US for countless months
The Sony Playstation 3 sells most in Europe for countless months
The Nintendo 3DS sells most in Japan for a long time until the recent PS-Vita price drop
That's the demo graphic of which game machine does best by region. Japan cares about portables and all kinds of weird Japanese games, and US cares about Xbox Live Arcade shooters and Europe cares about Sports and Racing games and prefer that on Playstation 3.
