159-X
(Published on 24. September 2026, 15:09 by PDN777)
Normal sudoku rules apply. Digits in the cells with blue squares form a complete set from 1-9. 159 rules apply: Each digit in column 1 indicates the position of 1 in its row (that is, if R3C1 is a 6, R3C6 is a 1). The same is true in columns 5 and 9 of the digits 5 and 9, respectively. Digits in a cage must sum to the little number in the upper left, and may not repeat in the cage. For clarity, the cage in R78C5 is a 5-cage. I think this puzzle is 2 stars out of 5 difficulty for many solvers. As always, comments welcome. Thanks!
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Solution code: First row of puzzle.
Comments
on 4. October 2026, 00:21 by DreamLibrarian
Very nice 159; I especially liked the extra region interaction
on 30. September 2026, 16:12 by PDN777
Thank you all for the solves and comments!
on 30. September 2026, 03:55 by PancakePie
Very nice and very fun! I only bumped it to two stars because the final trick I used wasn't available to me early on in my puzzle solving journey. But I loved it!
on 29. September 2026, 23:49 by jdwayne00
Great puzzle! Not difficult, but also the next step wasn't always obvious. Clever solve path and I enjoyed the addition of the extra region to a 159 puzzle.
on 28. September 2026, 17:35 by leapinglemur
Started on 159 puzzles recently (would have been scared off a month ago!) and this is one of the lovely ones. Thank you
on 28. September 2026, 03:33 by Aronana
Very satisfying solve for us!
