2025 Chaotic X-Sums (9x9)
(Published on 25. January 2025, 14:34 by Florian Wortmann)
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.
Link:
SudokuPad
Solution code: row 8
Comments
on 28. January 2025, 07:38 by Piatato
Smooth and fun, thanks!
on 28. January 2025, 00:20 by ElenaMonteille
Wow, this is totally amazing. It was hard for me (being my first try for a 4 star puzzle), but once I got through every step I can only get surprised by its elegance. I did it over and over again just to enjoy the logic. Thank you for this really nice puzzle!
on 27. January 2025, 15:14 by Jesper
Very nice!
on 27. January 2025, 09:02 by Kawkaz
Great puzzle, great construction!
on 26. January 2025, 17:12 by Snookerfan
Very nice! I loved how some of the regions were built with really cool logic. I gave it a 3 star difficulty, because I solved it faster than most of the comparable 4 star puzzles. Thank you for this fun gem.
on 26. January 2025, 15:34 by Freegerator
I really enjoyed this one!
on 26. January 2025, 14:38 by GeorgeTheToad2
Wow that was a tough ending but very enjoyable solve path. Thank you.
on 26. January 2025, 13:47 by Krisonium
Surprised that the solution code doesn't include hyphens (-) to indicate region border, overall a well polished and enjoyable sudoku!
on 26. January 2025, 09:51 by Wuschel
Das einzige Neujahrschaos, auf das man sich freuen kann. Danke!
on 25. January 2025, 23:10 by wuc
This is a brilliant cc puzzle. To me 3.5*. Huge fun thx.
on 25. January 2025, 21:54 by dennischen
a bit tricky near the end! cool puzzle
on 25. January 2025, 21:27 by Chaka
Simply top notch sudoku setting. Thanks a lot for sharing this, Florian, loved it very much! Are there more similar CC/X-sums puzzles?
on 25. January 2025, 19:55 by Niverio
Some lovely steps in there!
on 25. January 2025, 18:24 by askaksaksask
Between yours and Playmaker's recent outing, we're certainly seeing a moment for high quality X-sums CCs. I love some of the logic the regions employ, I love how the ? clues resolve, and this was simply fun to solve. Top tier puzzle making! Thank you.
on 25. January 2025, 16:39 by Visumation
Very cool puzzle. Really enjoyed this.
