Chaos Construction: Circle Sum (9x9)
(Published on 15. January 2024, 15:10 by Jesper)
Rules
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 small number in the upper left corner of a cell indicates the sum of the digits seen orthogonally from that location, given that region borders obstruct the view. The digit in the clued cell is included in the sum.
A ? can represent any digit. However, if any one ? in the grid represents a digit N, then exactly N of the question-marks in the grid must represent that digit.
The puzzle follows:
Penpa+: Chaos Construction: Circle Sum (9x9)
SudokuPad: Chaos Construction: Circle Sum (9x9)
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Solution code: Row 8 followed by row 9
Comments
on 22. May 2024, 22:52 by Christounet
Beautiful ! Masterpiece is an understatement to describe this gem of a puzzle. Finding a grid that solves is in itself such an achievement, but making one that solves like this is the next level of perfection ! Thanks :)
on 12. May 2024, 21:32 by Styku
I love choas construction puzzles and this is one of my favourites so far. Thank you very much for creating it. I had so much fun :)
on 3. February 2024, 23:32 by Myxo
Amazing puzzle! What a clean construction.
on 3. February 2024, 23:02 by MxTery
An absolute delight!
on 30. January 2024, 08:31 by Tacosian
Phenomenal puzzle!
on 18. January 2024, 21:11 by Niverio
Spectacular! The way both region building and the circular sums interact is nothing short of magnificent. I haven't solved something this elegant in quite some time, thanks a lot!
on 18. January 2024, 21:11 by MaizeGator
Jesper, we've never met one another or had a conversation. But, in solving your puzzle I felt like our brains were connected!
on 17. January 2024, 23:23 by Piatato
Excellent puzzle!
on 17. January 2024, 17:03 by gfoot
Brilliant, interesting logic, I felt stuck a few times but with more thought was able to find a way through. Very enjoyable.
on 17. January 2024, 14:06 by marcmees
Thanks a lot for this amazingly beautiful puzzle.
on 16. January 2024, 21:28 by samuel1997
The way to work out which set of digits have to be put in the ? is brilliant! Once this is deduced, the solving path is very smooth. Excellent!
on 16. January 2024, 15:55 by Snookerfan
Great puzzle full of gorgeous ideas. Thank you
on 16. January 2024, 14:39 by Default
Beautiful puzzle, thanks!
on 16. January 2024, 00:55 by Agent
Excellent puzzle! An interesting start with the cipher/circles and very smooth path once the key deductions are found.
on 15. January 2024, 17:47 by MagnusJosefsson
Wonderful puzzle with a smooth consistent path. Lots of fun!
on 15. January 2024, 17:29 by Playmaker6174
What an incredibly clever and satisfying puzzle! It stunned me that how tight and well placed the positions of the question marks were, as much as how the regions were determined one by one throughout the solve :o
on 15. January 2024, 15:56 by KNT
A long overdue new puzzle :-)
really great despite me not being the biggest fan of circle counters.
