Here's a little device I made recently as a present. It's a box that won't open until the recipient discovers the secret of where on the planet to move it. :slight_smile: http://arduiniana.org/2009/10/the-reverse-geocache-puzzle/ Mikal

The Reverse Geocache Puzzle

system October 17, 2009, 5:58pm 9

Clever! a truly cool gift, good job.

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