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YouTube user yankeyan altered his Kinect gaming interface so that he could play Super Mario Bros. by mimicking Mario's movements:

I programmed it to recognize my motions and passed the virtual button presses to the NES emulator. I could have placed a simulated keypad right in front of me that I can press with my hands, but I thought full body gestures were more in the spirit of Kinect. Of course, Mario isn't designed to be played like this, so this is really really hard.

via Technabob