159 XV's
(Published on 28. August 2026, 10:50 by ggwp)
Normal sudoku rules apply. Each row, column, and box must be filled with the digits 1-9 exactly once. Cells joined by V's sum to 5 and cells joined by X's sum to 10. All X's and V's have been given. Digits in columns 1, 5, and 9 determine the positions of digits 1, 5, and 9 in each of their respective rows (ie. if R2C1 is a 7, then R2C7 is a 1).
Solve on CTC here!
Feedback is appreciated!
Solution code: Row 1 (read from left to right)
Comments
on 4. September 2026, 20:30 by zee_zuper_beeg
Very enjoyable. Didn't even realize there was a negative constraint until I was reading comments... I did not need it.
on 4. September 2026, 11:21 by Ceramics-Quintet6
I did use the negative constraint. Definitely doesn't seem like a beginner puzzle.
on 30. August 2026, 12:58 by Myfyr MJ
Very nice and very easy. I don’t think I used the negative XY constraints though.
on 30. August 2026, 03:07 by thegreatgazoo
Nice flow. But I never needed the negative constraint.
on 29. August 2026, 04:59 by paintspotinfez
A fun one! I think it's even fully solvable without even thinking about the negative constraint / the "All X's and V's have been given" rule! :D
on 28. August 2026, 17:35 by Mozart40
Delightful!
on 28. August 2026, 16:41 by AlSina
Many thanks, enjoyed!
on 28. August 2026, 13:06 by RockyRoer
Nice - much easier once you treat it like it's an easy XV puzzle instead of a hard one. Thanks for sharing!
on 28. August 2026, 12:56 by rojspencer
Approachable index puzzle with an enjoyable solve. Thanks.
