I usually complain about number puzzles and the need to bash through them to get to the answer with brute force and ignorance. (And Excel.)
Well, I apologise.
No previous puzzle has been remotely as tedious as this one. It has elevated mindlessness to a new level.
Clearly, that makes me excessively dim, because all that I could deduce without a trial and error approach was the two zeros and the value of one cell.
Nice endgame, but an appalling experience.