Numbers: A Challenging Challenge Mystery Cache

The coordinates for this cache IS at the posted location. BUT, in order to log this as a find, you must complete the challenge. Play nice and only search for, sign, and log this AFTER you have done so.

I really love Challenge Caches. Maybe you do too. Let's hope so because this one is not very easy to qualify for.  That's why I am giving this one a 5/5 rating.  The actual hide is more of a 1.5/1.5

IN ORDER TO LOG THIS CACHE AS A FIND, YOU MUST FIND 100 "MYSTERY TYPE" CACHES WITH THE WORD "CHALLENGE" IN THE TITLE OF THE CACHE. You can demonstrate this by posting a link to a bookmark, posting a list of qualifying caches in your log, or posting a screenshot(s) in your log. Once you have met the requirements, go find it and sign the log. The Difficulty and Terrain for this cache are a factor of the effort you will have to put into qualifying for the cache.