31+19 Shades of Grey
(Published on 26. July 2023, 21:51 by Mountainfarmer)
- The shaded cells must form one single line (as if drawn without lifting the pencil from the paper).
- The unshaded area must also be orthogonally connected.
- Shaded cells in each box must sum to 19.
- Green dots indicate cells where the number equals the number of surrounding cells that are shaded. All green dots are shown.
- Red dots indicate cells where the number equals the number of surrounding cells that are unshaded. All red dots are shown.
- The number outside the sudoku indicates the sum of the shaded cells in the diagonal.
Solution code: Third row from the top
Comments
on 29. July 2023, 14:35 by giladooshlon
very elegant
on 28. July 2023, 19:51 by Mountainfarmer
No the dots does not count as “surrounding”
on 28. July 2023, 03:57 by MonsieurTRISTE
Does the dot itself count as ‘surrounding’ cell?
on 28. July 2023, 01:23 by JayForty
Very nice puzzle, really liked the break in and the final part. Very original and clever! Thanks :)
on 28. July 2023, 01:12 by drbs
What a great puzzle! Congratulations.
