Colours in the (k)night XIX
(Published on 6. December 2025, 17:26 by Villse)
Next installment in my “Colours in the (k)night” series. I hope you enjoy it :)
Links to the previous parts of the series are given after the rules.
Rules:
Normal Sudoku rules apply. Place the digits 1–9 once in every row, column, and 3×3 box.
Anti-Knight: Cells separated by a knight’s move in chess cannot contain the same digit.
Disjoint groups: Cells in the same relative position in different boxes cannot contain the same digits.
XV: Cells separated by a V sum to 5; cells separated by an X sum to 10. Not all Vs and Xs are necessarily given.
Little killer: Digits along marked diagonals sum to the number indicated outside the grid.
Solve online:Sudokupad
Happy solving!
Here are the links to the previous parts of the series:
Solution code: Row 1 (9 digits)
Comments
on 9. December 2025, 01:31 by Exigus
That was amazing. But I probability missed a trick or two, took me quite some time. Loved it though. Thanks!
on 9. December 2025, 00:26 by itsid
That was great..
I couldn't see what alex saw at all... (I had perfectly fine options against his claim for very--VERY-- long!)
IDK I'm sure there was a cleverer way of doing it, but in the end I jumped off the cliff and made a bold decision and then backtracked to that mistake, since I couldn't find the contradiction other than by bifurcating sadly.
Once that was out of the way however, it suddenly fell apart entirely and essentially solved itself
Anyways, it's been a great puzzle, too bad I'm not sure I'm fit for that kind of difficulty ;-)
on 8. December 2025, 15:03 by Frankster
Another excellent instalment in the series!
on 6. December 2025, 21:13 by alexsmart
With these minimalist disambiguating clues, it is so tempting to try and use them earlier than intended. Like with this puzzle, looking at the 14 clue, I could immediately tell that the only way this puzzle disambiguates is if the 14 diagonal had two big digits on it.
I wonder if it is ever a valid technique to use in the spirit of the "uniqueness" techniques in normal sudoku.
