Newsbrief: Satoru Iwata, Nintendo's chief executive, has revealed that digital sales of New Super Mario Bros. 2 for the Nintendo 3DS have made up 5 percent of overall sales for the title in Japan. The game was released on July 28 in Japan, and over the past weekend in Europe and the U.S. As reported by the Wall Street Journal [subscription required], Iwata noted that the retail to digital sales ratio for the game was promising. "This initial offering going forward, we've gotten a good reaction going," he added. He also said that digital Japanese sales of Demon Training for the 3DS, a follow-up to the popular Brain Training series that was released last month, represent roughly a fifth of total revenue for the game. When asked why he thought digital sales for Demon Training were surpassing New Super Mario Bros. 2, Iwata said he believes it is because of its nature as a daily puzzle game, meaning that customers are happier to download the game rather than carry the cartidge around every day.