Chaos Construction: Region Borders #2
(Published on 22. October 2026, 11:00 by udukos)
Divide the grid into regions, each consisting of nine orthogonally connected cells. Each row, column and region must contain the digits 1 to 9 once each.
A circled digit in a cell indicates the sum of the lengths of all region borders of its own region encountered along straight lines through the cell’s edges where a border runs, stopping when a border turns. Note that the region borders on the edge of the grid count toward this total. There is no negative constraint (all possible circles are not given).
Here is a 6x6 example for illustration, with a link for solving online:
Links to the main puzzle for solving online: Sudokupad or Penpa plus
Have fun! :)
A circled digit in a cell indicates the sum of the lengths of all region borders of its own region encountered along straight lines through the cell’s edges where a border runs, stopping when a border turns. Note that the region borders on the edge of the grid count toward this total. There is no negative constraint (all possible circles are not given).
Here is a 6x6 example for illustration, with a link for solving online:
Links to the main puzzle for solving online: Sudokupad or Penpa plus
Have fun! :)
Solution code: Last row
Last changed on -
Solved by Piff, Christounet, haoju, marcmees, MagnusJosefsson, Clipper, smckinley, oiyad, nevermore, karlmortenlunna, crow-jane, shifman23, Jesper, fryguy1013, Isael, MPR, katieee1008, Snookerfan, henrypijames, Phistomefel, wuc, dogfarts, Bathroomking, OJPS, jkuo7, misko
Comments
on 26. October 2026, 19:14 by wuc
Tricky new rule to me. 4* awesome fun puzzle thx.
on 25. October 2026, 12:26 by Snookerfan
Great puzzle and flow! Whenever you make a deduction, check it a few times, because there always seems to be another way. Thanks!
on 23. October 2026, 21:08 by Jesper
Great puzzle!
on 22. October 2026, 22:03 by MagnusJosefsson
Great puzzle, fun and original!
on 22. October 2026, 15:21 by marcmees
very nice. Thanks
on 22. October 2026, 14:43 by Christounet
Great puzzle! Some very cool geometric combinations here. Thanks :)
