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Eiji Hayashi, a PhD student at Carnegie Mellon, built this ingenious game out of an Arduino Mini and a matrix of LEDs which double as light sensors, triggered by a laser pointer. See Hayashi’s website for schematics and source code.

John Baichtal

My interests include writing, electronics, RPGs, scifi, hackers & hackerspaces, 3D printing, building sets & toys. @johnbaichtal



  1. JennaSys says:

    Eiji did a great writeup on how this works and included clear source code. Did anyone find the video he mentioned though? It’d be cool to see this build in action.

  2. danielpower says:

    I didn’t see the 100mw green laser pointer, where was it?

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