The Diamond Sea (XY Differences Chaos Construction)
(Eingestellt am 10. Mai 2025, 06:00 Uhr von tallcat)
Chaos construction: Place the digits 1 to 9 once each in every row, column, and region. Regions are orthogonally connected and must be located by the solver.
XY Differences: A diamond between a pair of cells indicates that they belong to different regions, and that the difference between the digits in them equals either the left-most digit in the same row or the top-most digit in the same column as the pair. All possible diamonds are given i. e. where there is no diamond, either the cells belong to the same region, or the digits have the wrong difference (or both).
Here is an example puzzle (not solvable) to illustrate the rules.
Here is the real puzzle
Can be played online at Sudokupad
Lösungscode: Column 8 (top to bottom) with '-' to represent region borders
Kommentare
am 28. Mai 2025, 10:11 Uhr von Bankey
Tough but great fun. Thanks, @ tallcat :).
am 16. Mai 2025, 17:34 Uhr von virus_dave
I found this to be very challenging but also quite rewarding. Alas I did get stuck at one point and effectively had to bifurcate to disprove one of two options. I'm sure there was something I missed, but for the life of me I couldn't find it.
am 14. Mai 2025, 18:53 Uhr von dustpan
Absolutely loved it. For me, that's the perfect combination of challenging but brutal. Enjoyed the use of the negative constraint too.
am 13. Mai 2025, 05:45 Uhr von glum_hippo
The knocking-off of the socks was my favorite part!
am 12. Mai 2025, 21:35 Uhr von avishai
So much fun! Thank you, this was delightful, and a very satisfying solve
am 12. Mai 2025, 17:47 Uhr von Jesper
Very nice! Fun and approachable CC, thanks!
am 12. Mai 2025, 17:17 Uhr von Asphodel
Wow, surprisingly smooth for a 4 stars
am 11. Mai 2025, 23:53 Uhr von GeorgeTheToad2
Another Banger of a puzzle. Got stuck several times but finished in just over an hour. Thank you Tallcat.
am 11. Mai 2025, 22:10 Uhr von thoughtbyte
Great, fun CC. And not too tricky, thanks!
am 11. Mai 2025, 20:30 Uhr von StephenR
A gem, which flowed very smoothly from start to finish, thanks.
am 11. Mai 2025, 06:01 Uhr von Juiceshack
Easily one of my favorite puzzles Ive ever done. Was struggling to see how it would solve for a while and then the trick in column one finally clicked. Well done!
am 11. Mai 2025, 01:44 Uhr von Exigus
Intimidating at first but flowed nicely. Thanks! Glad I had some experience with XY differences from Glum Hippo's fossil hunt even if it was a long time ago
am 11. Mai 2025, 01:13 Uhr von Chaka
Oh this is so clever! Loved it, thanks for sharing!
am 11. Mai 2025, 00:47 Uhr von askaksaksask
Very clever. The XY- difference is a great variant to drive a CC puzzle. Some fun logic along the way. A more accessible CC puzzle as well. Very nicely done; sharp setting as always. Thank you!
am 11. Mai 2025, 00:19 Uhr von Tank
Beautiful puzzle! Mind blowing, enjoyed it very much.
am 10. Mai 2025, 23:53 Uhr von Myxo
Fantastic!
am 10. Mai 2025, 23:21 Uhr von Piatato
Lovely!
am 10. Mai 2025, 18:08 Uhr von Sinuit
Wonderful puzzle! Thanks for sharing. I loved the ruleset being easy enough to understand and getting my head around, but also giving lots of nice deductions. My solving time was somewhere between 3 and 4 stars.
am 10. Mai 2025, 17:02 Uhr von mihel111
Great puzzle. 4* seems fair to me. Great Sonic Youth tune by the way. My head really went through the washing machine.
am 10. Mai 2025, 16:38 Uhr von wuc
A 4* to me. What a beauty. How the regions unravel is awesome. Great great fun thx.
am 10. Mai 2025, 14:43 Uhr von Franjo
Fantastic CC, a bit easier than expected (though I got stuck at some point until I could open my eyes…). Thank you very much for creating and sharing this wonderful puzzle.
am 10. Mai 2025, 12:53 Uhr von Snookerfan
Very nice puzzle! Thank you
am 10. Mai 2025, 11:20 Uhr von Christounet
Nice! Thanks :)
am 10. Mai 2025, 09:48 Uhr von marcmees
very nice. thanks
am 10. Mai 2025, 08:48 Uhr von rameshsrivats
Great puzzle. That 5* difficulty looked intimidating but turned out to be far more approachable than that.
am 10. Mai 2025, 08:21 Uhr von h5663454
3.5/5
