String Quartet
(Published on 5. November 2023, 01:26 by IcyFruit)
Normal sudoku rules apply. Divide the grid into 4 orthagonally connected sections such that each section shares an edge with every other section and no 2x2 area is occupied by only one section.
Cells on the same line belong to the same section. Each section has a different constraint which all of its lines must obey. The constraints for each section are:
1. RENBAN: Digits on a line do not repeat and form a consecutive set, in any order.
2. PALINDROME: The digits along a line are the same when read from each end.
3. GERMAN WHISPER: Digits which are adjacent on a line must have a difference of at least 5.
4. REGION SUM: Each segment of a line within a 3x3 box must have the same sum. The sum may be different for different lines.
Solution code: Columns 5 and 8, top to bottom
Comments
on 17. February 2024, 14:06 by Vebby
Wonderful puzzle! Beautiful, clean logic.
on 9. December 2023, 18:38 by ryanprobably
Very nice and quite challenging. Even after all the difficulty to color, the ensuing sudoku presents a solid challenge in itself.
on 26. November 2023, 05:29 by Nightmare2805
That was brilliant. I loved it.
on 25. November 2023, 16:38 by Mr.Menace
Fantastic! Please keep setting these marvelous puzzles for us to enjoy and be inspired by!
on 25. November 2023, 10:48 by Onkel_Dagobert
The rules were somewhat unclear to me. A region sum line in one single box usually makes no sense, which is why I did not even consider such a thing. It was only after giving up initially and reading the comments that I learned that this was allowed. After that, the puzzle was still very hard for me, but also very enjoyable. What a brilliant mind it takes to set something like this up.
on 25. November 2023, 03:08 by heliosfant
Unfortunately it was not clear from the ruleset that a region sum line in a single box is allowed. Maybe it also just because I am bad at English. Apart from that It was a stellar experience. Thank you for the puzzle.
on 21. November 2023, 18:58 by Al Fresco
Wow. I think you've raised the bar with colouring puzzles here. What an incredible sudoku :)
on 21. November 2023, 01:12 by Agent
Excellent puzzle! I greatly enjoyed both parts.
on 19. November 2023, 20:14 by madhupt
Another brilliant puzzle from @IcyFruit. It flowed really smooth but was really hard for me. Thanks for sharing!
on 16. November 2023, 23:44 by Fool on Hill
Another ridiculously good puzzle - I took a recommendation from Myxo, and am glad - add me to the fan club.
on 10. November 2023, 23:14 by Playmaker6174
You're an insane person for making a 4 colors yin-yang puzzle, but you're also a real genius for making a 4 colors yin-yang puzzle with a flow this good, from the sections connectivity to the sudoku resolution.
Take a bow please, I'll remember this one for a long while.
on 10. November 2023, 23:07 by Myxo
Another masterpiece! Just brilliant. I look forward to solving more of your creations in the future :)
on 8. November 2023, 08:35 by jinkela114514
@aspirin_waffle , not necessarily
on 5. November 2023, 10:22 by IcyFruit
Fixed solution code description
on 5. November 2023, 09:57 by SeveNateNine
It's column 5 and 8 I think
on 5. November 2023, 09:53 by sanabas
Seems to be a typo in the solution code, or its description.
edit - thanks, columns 5 & 8 worked.
on 5. November 2023, 09:11 by SeveNateNine
Excellent puzzle that challenges your intuition. Thanks!
on 5. November 2023, 03:09 by aspirin_waffle
does a region sum line need to enter more than one box?
