Nintendo president Satoru Iwata unveiled the hotly anticipated successor to the Wii gaming console last week at the E3 games show in Los Angeles. The Wii U, which won’t go on sale until next year, features a tablet-style controller that lets gamers take the game “off the TV,” and play using both screens or surf the Internet. But while the device got a warm reception from the assembled masses, it didn’t fare so well among investors. Nintendo’s shares fell nearly 10 per cent over the following two days. Analysts said it wasn’t immediately clear how the device worked. Was it just another tablet, or a whole new outlook on gaming, as Iwata promised? It didn’t help that no full-fledged games are yet available to demo the hardware. Of course, the original Wii was met with a similar puzzled response following its initial debut five years ago. Nintendo’s shares later tripled as the console went on to become a bestseller.