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This puzzle will take you through a bit of decryption. And by a bit I mean a devilish amount. If you are able to work through the multiple encryptions, you'lll be rewarded with a smiley on your map. Don't worry, each new stage reveals something about how to get through it. Keep pushing and eventually you'll be there. Oh, and BYOP while you're at it.
You can check your answers for this puzzle with me. Sorry, the Geochecker link is down.