Puzzle cache
From GeoWiki
A Puzzle cache is a geocache which requires the geocacher to solve a puzzle in order to find it.
Puzzles vary from the simple to absolutely diabolical. Difficult puzzle caches can take weeks to solve.
007 is an example of a Mystery Cache in Adelaide.
i!8: GET SMART now archived, but reputed to be one of the hardest puzzle caches in Australia. There is a secret behind-the-scenes look at i!8: GET SMART for wiki readers.