Normal sudoku rules apply, but the orthogonally-connected 9-cell regions must be determined. Clues outside the grid give the sum of all digits sandwiched between the nearest and farthest region border in that row/column. (Note: any row or column with a clue must contain at least two region borders.) For this purpose, the edge of the grid is not counted as a region border.
The corner clue on the positive diagonal works the same way, counting a region border each time adjacent cells along the diagonal are in different regions.
Here is an example puzzle to demonstrate the ruleset:
Solve online:
F-puzzles
Penpa+ (recommended)
CtC app
Lösungscode: Row 6, then column 6 (18 digits, no spaces).
am 14. Mai 2024, 23:22 Uhr von wuc
Chaos is the final boss for me. Fought a hard long fight. Definitely on my upper limit of skill. But what a great setting. No clue how you can set such a masterpiece. Great fun thx.
am 20. Februar 2024, 18:10 Uhr von Myxo
Wonderful construction!
am 3. August 2023, 23:33 Uhr von Bankey
Very tough, and great fun! Thanks, @ grkles :).
am 27. Februar 2023, 15:41 Uhr von Mr.Menace
Very nice and smooth chaos construction! Thanks sir grkles!
am 14. Juni 2022, 20:35 Uhr von Snookerfan
I Love chaos constructions and this was a great one!
am 13. Juni 2022, 11:14 Uhr von ICHTUES
Very cool! Once I was into the ruleset, it wasn't that hard anymore. I really enjoyed it.
am 7. Mai 2022, 17:17 Uhr von Florian Wortmann
Added to favourites :-)
am 22. April 2022, 03:54 Uhr von Agent
After breaking the puzzle twice, I was finally able to solve it. A fascinating idea and clever execution. Thanks!
am 20. April 2022, 17:58 Uhr von wildbush7
Wow, I'm completely stumped. Would love to see someone stream the solution to this.
~~~
@wildbush7 - there are a couple videos if you want to watch. wenchang posted one below, and also Niverio streamed a solve of it on Twitch here: https://www.twitch.tv/videos/1452867659?t=04h36m37s
am 19. April 2022, 21:08 Uhr von Playmaker6174
Really exceptional setting and a beautiful solve path! Despite the easy start, it actually tended to get harder and harder but no less interesting, particularly enjoyed some big deductions in later half :}
am 17. April 2022, 23:50 Uhr von wenchang
https://youtu.be/8Md8R4rph1A
very nice puzzle. A video in Chinese.
am 16. April 2022, 16:39 Uhr von twobear
Beautiful puzzle. Thank you!
am 14. April 2022, 10:04 Uhr von Christounet
Great puzzle with very nice contruction moments ! Love these chaos constructions, so much fun ! Thanks for setting this !
am 13. April 2022, 23:06 Uhr von MagnusJosefsson
Excellent puzzle! Very smooth and well balanced. Thanks!
am 12. April 2022, 16:09 Uhr von kolot
It was fun!
am 12. April 2022, 13:44 Uhr von grkles
Added example puzzle.
am 12. April 2022, 12:40 Uhr von Piatato
Fun and beautiful puzzle! I had a great time solving it!
am 12. April 2022, 09:31 Uhr von marcmees
Very nice. thanks.
am 12. April 2022, 05:45 Uhr von Elliptical
Fun puzzle. It started not too hard but got harder and harder.
am 11. April 2022, 22:11 Uhr von Niverio
Im glad you set a great puzzle, otherwise I would be upset with you stealing my CC idea :P Very nice.
am 11. April 2022, 21:55 Uhr von Jesper
Great puzzle, thanks
am 11. April 2022, 21:00 Uhr von Vebby
Excellent! Tough but fair solve path. Greatly enjoyed identifying and completing the regions. Thanks grkles! :)