Chaos Construc-to-N
(Published on 15. October 2025, 20:10 by mellowrobinson)
Up to N-sums are so cool, I couldn't help but make them into a Chaos Construction. Thanks to all testers and of course sujoyku for the ruleset. I hope you enjoy it!
- Chaos Construction:
- Divide the grid into nine orthogonally connected regions, each consisting of nine cells. Fill every cell with a digit 1-9 without repeats in any row, column, or region.
- Up to N-sums:
- A clue outside the Row or Column N indicates the sum of all digits up to the cell that contains the digit N. (The digit N itself is not included in the sum.)
- A question mark (?) stands for any number greater than zero.
- Additionally, all digits up to the digit N are in the same region, and the digit N is in a different region.
Solution code: Row 3, with dashes (-) for internal region borders e.g. 123-45-678-9
Comments
on 27. October 2025, 08:31 by PancakePie
Very hard, but very fun! I'd say 4 star difficulty for me, but once I found that one piece of logic, the journey was a blast. Thank you for this beauty!
on 20. October 2025, 20:55 by dzamie
This was tough! I got stuck a couple of times (admittedly, one of them was from not realizing I'd double-tapped a pencilmark and erased it), but it stayed engaging throughout.
Always nice to find a CC puzzle I can actually do, heh.
on 18. October 2025, 22:54 by Exigus
Brilliant construction, thanks!
on 17. October 2025, 20:47 by AdarshN
Really lovely construction, finding where the constraints were acting was a real joy the whole time.
on 17. October 2025, 01:14 by ThePedallingPianist
This is such a smooth and satisfying puzzle, with a beautiful break in and a decent but never unreasonable level of spice right to the end! Superb construc-to-n! :)
on 16. October 2025, 19:46 by wuc
Awesome setting. The last idea was more tricky to me than all the rest. Great fun thx.
on 16. October 2025, 14:23 by Franjo
A wonderful CC! Thank you very much for creating and sharing this beautiful puzzle.
on 16. October 2025, 13:57 by Christounet
Cool idea. Thanks :)
on 16. October 2025, 12:34 by Manta-Ray
That was amazing! Very approachable and smooth solve, thanks!
on 16. October 2025, 11:12 by Snookerfan
Brilliant puzzle! The rules interact really nice. Thank you
on 16. October 2025, 10:08 by Fizz
That was a lot of fun, thanks a lot!
on 16. October 2025, 08:16 by zardoz37
I found this quite challenging, but there's no doubt it's beautifully set.
on 16. October 2025, 04:12 by Chaossudokusplease
Great chaos puzzle, felt pretty approachable! I kept forgetting that there were some actual totals among the question marks which lost me a lot of time haha
on 16. October 2025, 01:53 by mathpesto
A fantastic chaos construction!
on 16. October 2025, 01:42 by jakestilesowen
The world needs more chaos construction and this is a shining example of it in top form! Thanks for the puzzle.
on 16. October 2025, 00:41 by dkfan9
Excellent! I am not often a fan of chaos puzzles but the N constraint made this one approachable and very fun.
on 16. October 2025, 00:35 by VicJameson
Fun ruleset. Don't think I've come across it before, but the way it all unfolded was lovely. Thanks so much.
on 15. October 2025, 20:24 by Calvinball
Loved this usage of up to N, some really fun and powerful interactions in here. Excited to forget this puzzle so I can solve it again in the future.
