AATG: "Nintendo producer Hideki Konno, while to speaking to Wired this week, revealed that Nintendo actually had glasses-free prototypes of its 3D technology as far back as the GameCube days.
Nintendo has been experimenting with 3D since the early NES days and has trialled it in many diifferent formats with varying levels of success. It's only recently that it's been satisfied with the results and confident enough to take the development further, hence the reveal of the 3DS.
Perhaps most interestingly, Konno also added that a 3D version of the much-loved but low-selling Luigi's Mansion was even developed. Could this see a return on Nintendo' new hand-held?"