WOW That cache was used in a number of Master of Mystery caches. You would think they would have a method of avoiding duplications
I'm familiar with the series as I've come across it in a couple of cities I visited. I never bothered to try and solve any of the pre-requisite puzzles until you started this thread. I just go through 6 of them in the last couple of hours before taking a break.
I just came across a Masters of Mystery cache in Porto, Portugal as it might be an overnight layover city on the way to Rome next month.
Have you come across the WHITE NOISE puzzle cache yet?
