Region Sum Lines Sudoku
(Published on 14. January 2022, 20:20 by Qodec)
Hat tip to rangsk for this fantastic constraint!
- Normal sudoku rules apply: Each row, column, and region indicated by thick borders in the grid must contain the digits 1 to 9 once each.
- Region sum lines: for each line, digits on the line have an equal sum N within each box it passes through. If a line passes through the same box more than once, each individual segment of such a line within that box sums to N separately. (There are no overlapping lines. Lines do not branch. When lines cross over each other at corners, they always go straight ahead.)
You can play this puzzle online using:
- CTC app: https://tinyurl.com/2p8ucay3
- f-puzzles: https://f-puzzles.com/?id=y2g4deps
Hope you'll enjoy!
Solution code: Row 5 and column 8. I.e. the 9 digits in row 5 from left to right, followed by the 9 digits in column 8 from top to bottom, for example: 123456789123456789
Comments
on 19. July 2024, 18:15 by StephenR
A very elegant construction, thanks.
on 15. November 2022, 19:50 by Richard
Lovely, but pretty tough puzzle. Thx!
on 5. September 2022, 00:59 by Christounet
Coloring was fun and the clues felt very precisely crafted to help at several stages of the souvent. Tanks.
on 21. March 2022, 22:08 by Aswen
Fantastic puzzle. Thank you for making it.
on 9. February 2022, 16:25 by Klausku
Beautiful construction and a smooth solving path. I really liked it. Thanks.
on 9. February 2022, 03:53 by apiyo
Love the puzzle Qodec! I reckon I would have just about matched Simon's time if I weren't even worse at scanning than him! =D
on 9. February 2022, 01:10 by kuraban
Lovely puzzle. Was genuinely surprised that was so easily solvable without a given digit, but everything comes together beautifully.
on 17. January 2022, 19:28 by Qodec
Thanks for the kind feedback everyone!
on 17. January 2022, 13:36 by stimim
Very cool puzzle, very enjoyed!
on 16. January 2022, 20:37 by Philipp Huber
Took me a long time, but I loved it!
on 15. January 2022, 15:42 by Manycoloredcoat
Great introduction to region sum lines sudoku, this is the puzzle I would recommend everyone new to the ruleset (unless there is an actual GAS I have missed) It was the first puzzle with this ruleset I managed to solve and while it definitely wasn't easy (3.5/5-4/5), every deduction still seemed quite fair and elegant. Of course I couldn't have solved this without watching a ton of CTC over the last year:D
on 15. January 2022, 15:24 by Kabuki73
Nice opening, than a bit tricky and finally a smooth finish! Loved it!
on 15. January 2022, 15:13 by abed hawila
Beautiful puzzle, loved it!
on 15. January 2022, 14:04 by Tilberg
Very, very nice, with some beautiful and eye-opening logic.
on 15. January 2022, 01:11 by tallcat
Stunning piece of work! Loved it.
on 14. January 2022, 22:31 by glum_hippo
It’s a gem
on 14. January 2022, 21:17 by Jesper
Good one, some really clever deductions, thanks!
on 14. January 2022, 21:13 by Playmaker6174
Lovely and very satisfying puzzle! The fact that this puzzle doesn't need a given digit really amuses me too :)
on 14. January 2022, 21:11 by Mad-Tyas
What a beautiful puzzle! Loved everything in it from start to finish. Thank you!
In my experience it was rather 3/5 for difficulty. But this is probably due to the experience from setting my Equalines puzzles.
