Chaotic X-Sums
(Published on 6. September 2023, 18:09 by Florian Wortmann)
This is the 9x9 follow-up puzzle to 2023 Chaotic X-Sums. Hope you enjoy!
Chaos Construction
Divide the grid into regions, each consisting of nine orthogonally connected cells. Each row, column and region contains the digits 1-9 once each.
X-Sums
A clue outside the grid is the sum of the first X cells in the corresponding row/column, where X is the digit in the cell nearest to the clue.
In addition, in every row/column with a clue, the first X cells are in the same region, and the X+1th cell is in a different region.
A ?-clue also has this region building property but the sum is unknown.
Even
The cell with the gray square contains an even digit.
Links:
CTC-App
Penpa
The Penpa link has answer check on numbers and edges (green).
Solution code: row 7
Comments
on 27. October 2023, 16:24 by codewizard
Very neat. That was the essential CC puzzle, smooth :-)
on 1. October 2023, 19:02 by Elliptical
Excellent Puzzle.
on 20. September 2023, 13:37 by Twan2797
Wow.
on 10. September 2023, 16:35 by Florian Wortmann
I'm quite blown away by all the positive feedback, guys. Thank you all so much!
on 10. September 2023, 13:38 by nearestneighbour
Amazing. Took me 2 hrs over the course of 4 days.
on 10. September 2023, 00:14 by wenchang
Nice！ Spoiler alert！ https://youtu.be/KMNZ_g1cCbk
on 8. September 2023, 15:27 by friqlyman
Fun and rewarding solve, thanks a lot!
on 8. September 2023, 14:07 by Black_Doom
What an amazing puzzle! Absolutely fantastic combination of rules, very smooth and satisfying solve path too
on 8. September 2023, 06:50 by henrypijames
I'm a chaos construction sudoku aficionado, taking on pretty much every CC that comes my way, which by now must total more than a hundred. And I have to say: This puzzle is the most exemplary CC sudoku I can think of, for the density and quality of classic CC logic it contains - including region connectivity, digit squeezing, and most importantly, [REDACTED] - is second to none. If anyone ever were to write a guide for setting and/or solving CC, this puzzle must be featured as the prime example.
on 8. September 2023, 06:37 by RedBarchetta
Well done, and dare I say... approachable? - given a two hour solve that is :) The logic is solid and fun and tricky, yet found the way through. Thanks!
on 8. September 2023, 04:04 by mathpesto
Beautiful setting! A very enjoyable solve, and not too tricky.
on 7. September 2023, 21:34 by alanb
I love it that every x-sum clue is actually helpful including the ?'s, very nice construction
on 7. September 2023, 18:52 by Florian Wortmann
Thanks everyone for the kind comments! :-)
on 7. September 2023, 17:26 by marcmees
enjoyed!
on 7. September 2023, 13:12 by samuel1997
Very nice!
on 7. September 2023, 12:09 by Franjo
Wun-der-schön! Und wenn man etwas besser aufpasst als ich, dann beschreitet man einen richtig gut ausgebauten Lösungsweg mit drei Sternen. Vielen Dank für dieses Juwel!
on 7. September 2023, 10:35 by Snookerfan
Very nice! Thank you
on 6. September 2023, 21:24 by Samson
Beautiful and creative combination of logic. A very satisfying solve! Thank you!
on 6. September 2023, 20:53 by AKernel
Very nice. It solves very smoothly. Danke Florian!
on 6. September 2023, 18:22 by thoughtbyte
Very nice, not too tough. Thanks!
on 6. September 2023, 18:13 by Florian Wortmann
fixed rules
