The Helpful Quad
(Published on 21. April 2025, 03:57 by Belamis)
Sudoku: Normal Sudoku rules apply.
Roman Numerals: Digits separated by an X sum to 10.
Renban: Purple lines contain a non-repeating set of consecutive digits in any order.
Killer: Digits do not repeat in cages, and sum to the small clue in the top left corner if given.
Quadruples: Every digit in a circle has to be assigned to one of the surrounding cells.
German Whispers: Along green lines, digits must differ from their neighbors by at least 5.
Constraint Regions: Each constraint type may contain no repeated digits anywhere in the puzzle. E.g. ALL cells connected by an X must contain no repeated digits, ALL cells around quad clues must contain no repeated digits etc.
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| Previous Constraint Region Puzzles |
| Regional Constraints |
| Foggy Regional Constraints |
Solution code: Column 6
Comments
on 9. July 2025, 20:09 by OBu42
The break-in is hard to find, but once you found it, the puzzle is ~1* ...
on 25. May 2025, 21:21 by maiaz
Took me forever to find the (relatively easy break-in)
Loved the non-conventional clues.
on 17. May 2025, 19:40 by QuiltyAsCharged
Wow that was a tough one for me, easily 4 stars! I really liked the logic with the whisper lines and x's. But the helpful quad and renbans weren't being very helpful to me personally
on 26. April 2025, 21:16 by Lovejoy
Brilliant!! Felt like I'd really solved something without getting too stuck
on 25. April 2025, 09:57 by PhilTheChill
Great puzzle, I espacially enjoyed the importance of box 9.
on 25. April 2025, 07:04 by BorisTheSnake
The break in logic was very nice, smooth sailing after that. Great construction!
on 23. April 2025, 11:36 by LehanLehan
What a beautiful break-in, thank you very much for the puzzle.
on 22. April 2025, 03:04 by haligonian
What a fun puzzle! The break in was, in my opinion, a bit tougher than 2* but then it starts to resolve soon after.
I loved this puzzle!
on 21. April 2025, 23:48 by Exigus
Very enjoyable light coloring
on 21. April 2025, 19:47 by keenbowl
Lovely puzzle, but to me the break in was neither obvious nor easy, but once I found it, everything went fairly smooth and easily.
Thanks for setting & sharing!
on 21. April 2025, 17:16 by VitP
whuff ... took me over an hour.
hint: THERE ARE FOUR DOMINOS.
also: those short green lines? HIGHLY restricted
on 21. April 2025, 09:03 by rameshsrivats
Really cool
on 21. April 2025, 08:14 by Bhuja
Thoroughly enjoyable. Thank you!
on 21. April 2025, 04:27 by Belamis
Corrected rules
