This isn't simply a list of "Unknown" Cache types in Manhattan. This is a list filtered for true puzzles that require good problem-solving chops (as opposed to other excellent Unknown Caches which require more task completion or information gathering). Lovers of the "Aha!" moment should enjoy these.
Difficulty for established caches is crudely estimated by calculating the average number of days between finds. (Obviously this is not a perfect measure, but bear with me.)
Difficulty ratings last updated May 2011.
If you manage to find at least 15 (or 30!) caches on this list, you may qualify for a special, limited edition Dastardly Pathtag! See this thread for more information: (visit link)
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