GamePro - The Nintendo 3DS was the talk of E3 2010. And its first quarter of sales was very impressive, selling over a million units in Japan alone. But when the fervor died down, Nintendo had to keep the momentum going with compelling software. And that is where Nintendo stumbled. You simply can't have a quarter of sales propped up simply by one game: Zelda: Ocarina of Time. While the game sold well, the 3DS itself sold abysmally in the spring quarter, with some estimating only 700k units sold.