I finished the succulent puzzle a few days ago.
While I was putting it away I was able to roll the entire puzzle over
so I could get a photo of the back.
Since I was not a part of the original puzzle piece flipping process,
I had no idea these letters were here until late in the construction process.
Once I figured it out, there was no way to un-know this secret.
It made the puzzle completion easier.
It was still not simple, but it was easier.
I'm moving on to a new puzzle tomorrow.