Unique Renbans
(Published on 11. July 2026, 15:45 by Phurba)
Rules:
- Normal Sudoku rules apply. Place the digits from 1 to 9 once each in every row, column, and 3x3 box.
- Anti-Entropy: No pair of orthogonally adjacent cells can contain digits from the same entropic set. The entropic sets are low (1, 2, 3), middle (4, 5, 6), and high (7, 8, 9).
- Unique Renban Lines: Digits on a purple line must form a set of consecutive digits in any order, without repeats. No two renban lines contain the same set of digits.
- Little Killer Arrows: The digits along each of the two indicated diagonals must sum to the same total which has to be determined by the solver.
Enjoy!
Click on the puzzle image to playSolution code: Row 9
Comments
on 14. July 2026, 15:13 by SennyK
Wonderful puzzle! :-)
on 14. July 2026, 05:26 by RedBarchetta
Took me a minute to wrap my had around it. Then as everyone else has said, it flowed very well. And by minute - I mean it took me 30 minutes of break-in and discovery before it became plug and play. Great puzzle, thanks!
on 13. July 2026, 19:17 by Exigus
Fantastic construction, thanks!
on 13. July 2026, 17:03 by Gunkan
Great puzzle, 4* for me, but could probably a slightly wrong tactic
on 13. July 2026, 16:12 by highonlife
There is no way this is a 3 star puzzle. At least 4.
Beautiful breakin
on 13. July 2026, 03:07 by Silverscree
Lovely, I really enjoyed that. Definitely felt like more of a 3 star to me, as I could just finish it over a lunch break :)
on 12. July 2026, 21:58 by NotThatItMatters
Yes, it took a second or two to figure out the correct tactic, but once found, the solution flowed very nicely. Excellent puzzle.
on 12. July 2026, 18:24 by Onkel_Dagobert
Ein großartiges, sehr schweres Rätsel. Vor allem sehr ungewöhnlich, da waren wirklich ein paar Schritte dabei, die für mich gänzlich Neuland waren. Wie man auf sowas kommt… ich kann da nur staunen!
on 12. July 2026, 12:18 by pmays123
Excellent construction! Very fun solve path and I really enjoyed how the unique renban lines rule participated. Thanks for sharing!
on 12. July 2026, 11:01 by Snookerfan
Brilliant puzzle! I loved the minimalistic setup, the solve path and the disambiguation by the little killers. I think the puzzle is less than 4 stars for difficulty: my solve time fits 2.5 to 3 stars. Thanks a lot!
on 11. July 2026, 22:53 by Briks
Liked it very much!
on 11. July 2026, 19:41 by BHUNTER47
Fantastic puzzle. The combination of entropy and unique renbans flowed very well.
on 11. July 2026, 19:28 by Starlight
Beautiful puzzle.
It took me a few minutes to realise what to do but once I did it flowed so smoothly and was a joy to solve.
