LunaticSpawn

Yes, I have already begun to think along those lines.... It sounds like an interesting idea until you consider the possibility that Cacher A could solve the puzzle then Cacher B finds the cache before Cacher A get to it. After Cacher B has closed the container, the solution to the puzzle solved by Cacher A would no longer match the code. A non-issue if you create it right. It would be easy to randomly generate codes for one-time-use (a list that is updated as people finish their puzzle). After that code has been used, it is just removed from the list for example. No one said that only one code would be valid at a time.

No, I don't want to ruin it for those that honestly solve the puzzle, I just want to prevent those that take shortcuts from getting a find that they haven't earned. I understand what you're saying, but I want to create a fun adventure that's going to be a real accomplishment for anybody that completes it, and not just be another find for cachers to notch on their belt on the way to their next 1000 milestone. TopShelfRob, You could most definitely create a unique solution to your puzzle problem . For example, a one-time-use code that unlocks your cache is revealed at the completion of your puzzle. This code could change everytime your cache was opened using it, requiring your cacher to solve the puzzle to find (and sign the log) of the cache. Now, lets say their friends tell them *how to* solve the puzzle, and they get their own code to use. Well, you could have also have a one-time-use puzzle that morphs as people solve it, all with the same relative difficulty. As I type this, I see how awesome this could be, now where to hide it is the question . -LunaticSpawn

Adding my own evidence. Found this "gem" at Hastings about a year ago. Couldn't pass it up. Several of the caches that they had in the film were interesting (one I thought was cool was in a junkyard). The movie itself was pretty bad, just a warning (and not too scary)...

Pretty sure I have seen this stuff, I am a computer engineer . So, I figured out the first step pretty quickly, but it looks like this one is going to take multiple steps.

Here is a link to the Richland Parks and Rec who hosts the Tri-Cities geocoin challenge.

They don't add the caches until the first day of the event, which in my link say's will be June 23. The caches remain active indefinitely, however you only get a coin until they run out (usually there are several hundred coins). You have to find 30 caches (10 each in the 3 cities). But the link to the event is all that you can get right now. I did the 2011 event which was 12 caches I believe with a Geocoin for finding at least 10 of them.

Tri-Cities Geocoin Challenge 2012 In Tri-Cities Washington.