I used the "alternative velocity display mode preset", removed the sand, took a screenshot and increased it's contrast, making the poorly written text visible. I have no idea how to do something similar with ingame tools and materials.
Update: Now you have to place ____ to find it!
I first tried finding it without unpausing, nothing seemed to indicate any encoded info - nothing hidden in any tmp values, both temperature and pressure were completely uniform. But there it was, staring at me. TEST, it said. And then I knew.
This save is very good for performance (testing).
wdym? i will unvote if not text but will vote when text