
Solving Puzzle Caches: Ciphers
Good overview, examples, and links for resources and help (including code breakers). Examples include Caesar Cipher, Monoalphabetic, Keyword, PigPen...

Picture from Cipher link above
Geocache Puzzle Solving 101 This link gets you to the Blog story and Geocache Links to a Geocache series with 10 steps - going through the various types of puzzles - strategy, tactics, trivia, wordplay, mathematics, logic, cryptography, steganography and lateral thinking.
The caches are in Florida - but there is a Virtual TB link to take the test and get a certificate! Cool!