Oxford Steganography Series (shared, public)
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A series of geocaches around Oxford based on the theme of steganography - hiding things in plain sight.
Use your geocaching.com account and your brain to discover the secret co-ordinates of each of the four boxes hidden around Oxford, then use your GPS receiver or your GPS-enabled smartphone to find each box and sign the log.
Print out the bonus puzzle and take it along to each of the four caches to decipher the codeword that will enable you to locate the coveted fifth geocache in the series, in the biggest challenge of them all.
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