A way around [X-sum Chaos Construction 9x9]
(Published on 20. September 2026, 03:30 by Christounet)
This is a chaos construction with X-sums, but with a region building rule that is not what is usually used in these puzzles. If you want to practice, you can try the 6x6 version first. Have fun solving!
The puzzle :
Rules :
- Chaos construction : Place the digits 1 to 9 once each in every row, column and region. Regions are orthogonally connected and must be located by the solver.
- X-Sums : Clues outside the grid represent the total of the first X digits in that direction, with X being the digit in the first seen cell. Additionnally, the first and the last cells of the sum belong to the same region. The other cells, if any, don't belong to that region. A question marks represents any digit from 0-9, but for a double digit number, it cannot have a leading 0.
Solution code: Column 2, with hyphens (-) for region borders. (Example: 123-45-6-7-89)
Comments
today, 04:31 by MaizeGator
Elegance factor off the charts! Just barely enough information in the clues to make progress.
Thanks for entertaining me during my awful meetings and my exam proctoring mon amie
on 21. September 2026, 17:50 by cyddrdrd
So cool! Thanks:)
on 21. September 2026, 09:31 by Snookerfan
Great puzzle with some really tough and rewarding steps. I had to get back at this after a good night of sleep and I immediately saw what I couldn't see yesterday. Thanks!
on 20. September 2026, 18:04 by 6rank
Very good puzzle which feels at least 4.5 * difficulty, therefor I rounded it up to 5* for difficulty :)
on 20. September 2026, 15:18 by Agent
Awesome, loved the geometry in the bottom-right area!
on 20. September 2026, 11:08 by Jesper
Enjoyed it a lot, thanks!
on 20. September 2026, 07:22 by Piatato
Great fun! Very engaging solve throughout! :D
