Marc, I am getting ready to go to Indy for Christmas and I can tell you that Indy is THE place for puzzle cache density. Out of 800 caches in the PQs (two geographic centers), there were over 150 mystery caches, most of which were puzzles. I’ve been working steganography, picture puzzles, puzzles involving brazilian gambling games, chemistry puzzles (apparently lots of chemist cachers down there), biological puzzles (involving a first order decay function of the blood serum levels of LSD admistered to a dog by the CIA (Cat Intelligence Agency) of all things) along with the normal math puzzles, language puzzles, regular codes, quizzes, etc. So far there are two that have really stood out.
First, this one (GCKJBG). I’ve worked out the first part and really want to finish it to see how it progresses. This looks like a really unique one. I think I will try to do a similar one up here.
On the other hand, this one (GCTNJT) is almost breathtakingly ridiculous. Its like the puzzle cache equivalent of a park and ride cache. Probably a lampost hide as well.