Quadruples are my favourite variant sudoku constraint :)) Hope you enjoy them too!
Rules:
Normal sudoku rules apply.
Quadruples: Digits in white circles must be present at least once in the cells the clue touches.
Kropki Dots: Digits separated by a white dot are consecutive. Digits separated by a black dot are in a 1:2 ratio. Not all dots are necessarily given.
XV: Digits separated by an X must sum to 10. Digits separated by a V must sum to 5. Not all X's and V's are necessarily given.
Solution code: Column 5
on 21. April 2026, 14:27 by SquareCat
Fun puzzle, thanks!
on 17. April 2026, 14:31 by WasabiKoala
Really enjoyable, the break-in ended being easier than at first glance. Quadruples really are interesting constraints
on 14. April 2026, 14:01 by macintux
Took me a moment for the break-in, the impact of the quadruples was more subtle than I anticipated, but everything flowed very smoothly after that. Very nice, thanks.
on 14. April 2026, 01:39 by marajade
Very fun! Quadruples are one of my favorite constraints and this showcased them nicely. It was the sort of easy but lovely puzzle that would be a good introduction for someone unfamiliar with this constraint.
on 14. April 2026, 01:05 by Fisherman
Very Neat.
on 13. April 2026, 22:43 by sujoyku
Lovely interactions between the quads and Kropki! Thank you, NotVeryNeat!
| Difficulty: | ![]() |
| Rating: | 94 % |
| Solved: | 242 times |
| Observed: | 2 times |
| ID: | 000SAV |