"If you listen carefully while walking around Hello apM, Doosan Tower or any South Korean department store you can hear the chimes of coins being collected in New Super Mario Brothers.
Department stores in Korea are notably different from Macy's or Shibuya's 109. Each retailer has a shoebox sized space to show their wares and is typically manned by a single person. When no one is actively browsing their dresses or ladies jeans, most of the women read books or watch shows/movies on their PC/electronic cash register.
However, the younger crowd plays with pink Nintendo DSes!"
Spencer of Siliconera reports his observation from South Korea: young girls fixed to their DSes.