Play online via F-Puzzles.
I always think it's a shame, when puzzles don't get many solves because they are very difficult. So I will try this.
Make this a four star puzzle by revealing the following lines (careful spoilers):
Hint 1: The puzzle is based on the concept of divisibility.
Hint 2: Compare the divisibility of two specific regions of the grid.
Solution code: First row and first column (18 digits).
on 2. May 2021, 12:39 by Philipp Huber
Hey cdwg2000,
thank you very much for playing, for the nice comment and for revealing the rating! :)
on 29. April 2021, 12:55 by cdwg2000
Very hard,Very nice!
on 15. February 2021, 23:10 by Philipp Huber
Thank you very much, udukos and marcmees! :)
on 15. February 2021, 16:24 by marcmees
challenging puzzle. thanks
on 15. February 2021, 16:22 by udukos
Very nice puzzle with a really cool opening!
on 14. February 2021, 09:23 by henrypijames
Very elegant, but not *that* difficult, even without the hint. The rough solution path was clear from the start, and the progression was more or less forced.
Response:
Thank you very much for playing and your message!
The five star rating was based on feedback from four solvers, but I can see your point. I guess If other comments suggest a lower difficulty rating, I can still change it to four. :)
on 13. February 2021, 23:31 by DiMono
I remember test solving this. It's a really nice puzzle. Thank you for creating and sharing it!