Logic Masters Deutschland e.V.

Region Sum Lines Sudoku

(Eingestellt am 14. Januar 2022, 20:20 Uhr von 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:

Hope you'll enjoy!

Lösungscode: 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

Gelöst von Mad-Tyas, Playmaker6174, Jesper, glum_hippo, DVFrank, CastleSheepside, SKORP17, logwal99, tallcat, polar, Elliott810, ScatterBrain, DiMono, rmn, mutex, Semikolon, Tilberg, abed hawila, Kabuki73, ... LeLoyJenkins, Grothenlace, Ragna, MagnusJosefsson, jalebc, wenchang, peterkp, sandrokv, Cane_Puzzles, Gilleo, Philipp Huber, PulverizingPancake, stimim, galgamer, soroush, ssaper, ___, ManuH, purpl
Komplette Liste


am 17. Januar 2022, 19:28 Uhr von Qodec
Thanks for the kind feedback everyone!

am 17. Januar 2022, 13:36 Uhr von stimim
Very cool puzzle, very enjoyed!

am 16. Januar 2022, 20:37 Uhr von Philipp Huber
Took me a long time, but I loved it!

am 15. Januar 2022, 15:42 Uhr von 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

am 15. Januar 2022, 15:24 Uhr von Kabuki73
Nice opening, than a bit tricky and finally a smooth finish! Loved it!

am 15. Januar 2022, 15:13 Uhr von abed hawila
Beautiful puzzle, loved it!

am 15. Januar 2022, 14:04 Uhr von Tilberg
Very, very nice, with some beautiful and eye-opening logic.

am 15. Januar 2022, 01:11 Uhr von tallcat
Stunning piece of work! Loved it.

am 14. Januar 2022, 22:31 Uhr von glum_hippo
It’s a gem

am 14. Januar 2022, 21:17 Uhr von Jesper
Good one, some really clever deductions, thanks!

am 14. Januar 2022, 21:13 Uhr von Playmaker6174
Lovely and very satisfying puzzle! The fact that this puzzle doesn't need a given digit really amuses me too :)

am 14. Januar 2022, 21:11 Uhr von 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.

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