Solution code: row 1, followed by column 1 (18 digits)
on 22. October 2023, 13:28 by Piatato
Lovely puzzle! I particularly enjoyed it after my obligatory 30 minutes of forgetting about the negative constraint, haha!
on 4. October 2023, 00:00 by StephenR
Fiendishly clever. I would not be surprised if one or two bits of logic passed me by, but happy to get to the end of this one, thanks.
on 31. August 2023, 02:23 by Christounet
Just amazing ! And even after the break-in come a few challenges along the way. Thanks !
on 31. March 2022, 04:24 by Novisnage
Fantastic! Loved every single step of it, the path was beautifully rewarding. Thanks!
on 8. September 2021, 20:11 by Vebby
Brilliant puzzle!! Using letters to represent numbers in certain cells really helped.
on 27. February 2021, 20:20 by Bobby
Beautiful and unique break-in!
on 26. February 2021, 10:07 by PixelPlucker
Fun and very well-crafted logical path, thanks for the puzzle!
on 24. February 2021, 13:38 by Jesper
In case anyone is struggling to find the break-in, I don't mind providing a small hint - just post a hidden comment with the request.