Reminds me of 3D Hidden Picture, a DSi Ware puzzle game, available in Japan: http://www.youtube.com/watch?v=h5QSclrIdlE
Supposedly this uses the DSi's camera the track the motion of the device and adjust the displayed image to give it depth.
Supposedly this uses the DSi's camera the track the motion of the device and adjust the displayed image to give it depth.