Colours in the (k)night XIX
(Eingestellt am 6. Dezember 2025, 17:26 Uhr von 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:
Lösungscode: Row 1 (9 digits)
Kommentare
am 9. Januar 2026, 09:21 Uhr von BG03
Was disappointed relative to the very high rating of this puzzle. It was a disjoint/anti knight/x wing elimination grind fest and it was not pleasant to spot all that using colours and letters. Perhaps people who like goodliffing might enjoy this but it was not for me. Also extremely easy to make mistakes - I restarted 3 times. I couldn't see the intuition mentioned in the first comment either. It took me 2.5 hrs to get to the point where I could conclude something about the nature of the killer diagonal.
(Spoiler)
Would suggest you label digits as letters and then use colours to enhance the spotting of disjoint/anti knight/x wing patterns.
am 30. Dezember 2025, 21:42 Uhr von snuuba
Wow, that was a tough one, many thanks
am 15. Dezember 2025, 17:30 Uhr von illandres
Took me nearly 5 hours over 4 days, but I'm happy to have solved it! Love these constraints and your coloring puzzles so this was a joy to get stuck, leave, and come back to until I finally got to the end!
am 13. Dezember 2025, 22:45 Uhr von Tws
That was hard work! After a very smooth start and good efford I stuck in a nightmare of colours. Although I loved the ruleset, I spent hours in the color jungle.
am 9. Dezember 2025, 01:31 Uhr von Exigus
That was amazing. But I probability missed a trick or two, took me quite some time. Loved it though. Thanks!
am 9. Dezember 2025, 00:26 Uhr von 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 ;-)
am 8. Dezember 2025, 15:03 Uhr von Frankster
Another excellent instalment in the series!
am 6. Dezember 2025, 21:13 Uhr von 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.
