With laptops, paper, and pens in hand it looked more like a university setting than a geocaching event.  On October 15^th geocachers gathered at Bull Run Regional Library and sat at the ready to learn the basics of geocaching puzzle solving.  Since 2011 Two000miler has held 8 puzzle caching workshops throughout the Northern Virginia area.  His class today touched on substitution, playfair, bacon, vigenère, and other cyphers as well as understanding where a puzzle creator can hide clues on a cache page.  His most important advice he gives on solving puzzles is “Read the entire cache page, write down what you know, and look for patterns.”