Death Spiral
(Published on 29. January 2026, 03:03 by Andrewsarchus)
Rules:
- Normal Sudoku rules apply
- Region Sum Line (blue):
Box borders divided the region sum line into segments with equal sums. - Modular Lines (teal):
Any run of three sequential cells on a modular line must contain one digit from each of the sets {1,4,7} {2,5,8} {3,6,9}.
Play Online:
sudokupad: Death Spiral
Solution code: Row 7
Comments
on 4. February 2026, 17:29 by Djirt
Для меня это точно 5*, а не 4*! Великолепное судоку, конструкция просто замечательная! Спасибо, что поделились!
on 30. January 2026, 02:34 by Silverscree
I agree on the 4 star suggestion of others, perhaps even a high 3 star. I would have struggled without note-taking though, so maybe the higher rating is fair!
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Thanks for the solve!
I posted it as a 4-star, but it got upvoted to a 5. ;-)
--Andrewsarchus
on 29. January 2026, 22:35 by chameleon
Great puzzle! Was it supposed to be hard?
on 29. January 2026, 07:41 by SennyK
Outstanding! This is a really beautiful construction, thank you for sharing :-)
on 29. January 2026, 05:12 by zzw
Very nice! Some pretty tricky but fun logic to figure out the sum.
