Puzzle caches are usually created by sadistic grad students.
I like multi stage caches, but puzzles make my brain hurt.
Did an old 5 stage multi where you had to project all the waypoints just this weekend. GPS wasn't as accurate when it was made. Spent a blissful 4 1/2 hours in the rain, jumping creeks and scrambling up tracks. I couldn't have been happier.
I allready graduated to a pocket PC & cachemate to store all the data. I'm also using GSAK to manage the database.
The Mt Albert and Avondale areas of Auckland have a couple guys just one uping with the puzzles. It's saturated with them.