Regional Chaos
(Published on 11. January 2025, 19:00 by arbitrary)
- Chaos Construction: Divide the grid into regions, each consisting of nine orthogonally connected cells. Each row, column and region contain the digits 1-9 once each.
- Region Sum Lines: Region boundaries divide blue lines into at least two sections of equal sum.
- Digits in marked squares are the sum of digits seen orthogonally within the same region as themselves. Region boundaries block sight.
SudokuPad: https://sudokupad.app/y0wnj3vkfo
Solution code: Column 3 top to bottom with hyphens separating regions e.g. 123-45-6-789
Comments
on 29. July 2025, 20:45 by dustpan
Very nice! This one took me a long time for a CC, but got there eventually. The first half was a slog, but each deduction ended up not feeling too difficult once I spotted it. It was just a matter of looking in the right spot.
on 25. January 2025, 22:46 by Silverstep
Neat and elegant! Although I must admit I don't fully understand the math involved for the break-in.
on 13. January 2025, 00:39 by askaksaksask
Quite tricky, but the given square cells are really cool. Definitely adds a cool dynamic to some great CC/RSL fare. Thank you!
on 12. January 2025, 14:13 by Snookerfan
Beautiful and very rewarding puzzle! Very hard in my opinion. Thank you
on 11. January 2025, 19:15 by Briks
No, I see my fault
on 11. January 2025, 19:13 by Briks
Are digits in marked squares included in the sum?
