3 LEDs powered by fingers - puzzle

Henryk GasperowiczOctober 8, 20131 comment

I would like to present my last puzzle design.

If you like such puzzles, I invite you to watch the movie below.

How does it work ?

Previous post by Henryk Gasperowicz:
   Series circuit - 3 LEDs


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Comment by trjaegerJanuary 8, 2015
There is a hidden battery inside of each switch.

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