As of January 1, 2024, over 150 people from across North America, Australia, and Europe have done it. So can you!
NoBucksRanch - Co-FTF!!!
PDXJim - Co-FTF!!!
ernie66 (from Colorado!) - 3TF!
When I first heard about the Fizzy Challenge, I thought it would be quite impossible for me to complete it. After all, I'm a middle-aged mom with thrice repaired knees - I didn't think I could get all the high-terrain caches.
But one day, in a conversation with caching friend ornith, he said that if he could do it, I could do it too. So I decided to try.
And, silly me, I love puzzles so much that I thought it would be fun to see how far I could go filling in the Fizzy grid with mystery caches. It took me over three years, and travel to Washington, British Columbia, and New York for some of the rarer combinations, but I did it.
Now I see that others are trying to do it too. Oh you silly people.
It takes a lot of effort and commitment to fulfill this challenge, and such an effort deserves more than a GRC or LPC. This cache is an ammo can at the posted coordinates with some nice swag.
You just (just) have to find a mystery cache for each of the 81 different difficulty/terrain combinations in the Fizzy grid.
Document your qualifications any way you deem fitting. Here's a link to the convenient Project Geocaching challenge checker:

The cache is a black ammo can at the posted coordinates. D/T for the hide is about a 1.5/1.5. Please make sure it remains hidden. Parking coordinates are also given. Look for pink ribbons.
Good Luck!