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"Just when you think Pong can't be played any other way, yet another creative soul emerges to prove the notion wrong. Mike McCracken has managed to remove all visual aspects of the game yet still maintain the core goal by enabling one's head to make the motions typically assigned to the hands. Essentially, a sound is emitted from the headphones on one side or the other, and the gamer has to tilt his / her head just so until the noise is centered. This back-and-forth sequence speeds up to intensify the challenge, and if you can't manage to keep the ringing front and center, an unpalatable buzzer sounds and a light turns on to alert you of your defeat. Really, it's way more clear how all this works in the video below, so have at it.[Via MAKE]Audio Ping Pong from loneconspirator on Vimeo."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.engadget.com/2008/04/25/audio-ping-pong-lets-your-ears-noggin-do-all-the-work/>