Hack Your Hike with this Arduino Puzzle Geocache - Hackaday

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Hack Your Hike with this Arduino Puzzle Geocache Hackaday Cleverly, [cliptwings] mounted the volt battery for the Arduino on top of the inner door so that cachers can replace a dead battery and play the game; strangely, the cache entry on Geocaching.com (registration required) does not instruct players to ...