Geocaching is free. Of course we all know that.
However to get the most out of the game people will usually need to spend a little money here and there.
One of the expenditure lines is for Tools of The Trade aka TOTTs.
There are many of these ranging from things which help you to solve puzzles, project coordinates, or to access a GZ or a cache at a GZ. Some caches can not be accessed without a specific TOTT. And sometimes this requirement is reflected in either or both of the D and T ratings.
This series contains caches which you will probably find easier with one or more TOTTs. Whether it is working out the final location or accessing the cache once there, there will be something where a TOTT will help. But part of the fun is that we won't necessarily tell you in advance which TOTTs you might need. Of course this may not be a problem for the experienced geocacher. But for newer ones some of these might open new windows of opportunities.
This is #13 in the series. It is a Puzzle Cache.
During the initial COVID-19 lockdown in early 2020 a number of puzzles were circulated on social media. Each had a few icons making up equations with the aim being to find the answer to the final equation. They were meant to be tricky. Some were very subjective.
During this period a new image appeared on one feed. It had the caption -
"For those of you sick of BODMAS tests on FB. This, courtesy of Zytheran".
Many people seemed to assume it was a joke. But Brad thought it might be real. It was. Brad solved it, then sought and gained permission from Zytheran to use the puzzle on a geocache page.
So here, after a long gap, is a new geocache using a puzzle courtesy of Zytheran. Of course there is a slight Brad twist. 
You can validate your puzzle solution with certitude.