Top Japanese Sellers of 2005
Gamasutra reports on a partial list of the top-sellers in the Japanese market for last year. From the article: "With the Nintendo DS dominating hardware sales during the year, it was no surprise to find Oide yo Doubutsu no Mori (aka Animal Crossing: Wild World) at number one with approximately 1.17 million copies sold. The second ranked title, and one of the few games to feature prominently in the top tens from all three countries, was Sony's Gran Turismo 4 for the PlayStation 2, with 1.07 million units sold."
Isn't it true that these numbers only count toward new games. If someone bought a game new, then sold it back. And some other person bought the used game... it still counts as 1 unit sold.