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Cruel and unusual


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"So how about giving a present that demands a little more than simply scribbling a thank-you card; that’s just what Mikal did for the friend who introduced him to Arduino tinkering. He constructed the Reverse Geocache Puzzle, a wooden box that would only be unlocked when within 2km of a location Mikal preprogrammed into it.


To make things more interesting, the box only allows fifty attempts at locating the correct geocache position."


Here and here.

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