New Super Mario Bros. 2 and Demon Training are the first Nintendo games that were released at both Japanese retailers and the Nintendo 3DS eShop. According to Nintendo president Satoru Iwata, in Japan, 5% of those who purchased New Super Mario Bros. 2 bought the downloadable version of the game, and 20% of Demon Training consumers downloaded the title from the Nintendo eShop.
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Source:
http://mynintendonews.com/2012/08/17/only-5-of-new-super-mario-bros-2-consumers-bought-download-version/