Unique Ratios
(Published on 7. October 2024, 21:34 by Burak Alver)
Place subsets of digits 1-9 into every row, every column, and every 2-by-2 box so that no digit is repeated in any row, column, or box.
Kropki Dots: Digits separated by white kropki dots are consecutive, and digits separated by black kropki dots have a 1:2 ratio. All possible dots are given, i.e., a 1:2 ratio is not present in the puzzle.
Killer Cages: Digits in a killer cage sum to the clue in the top left corner of the cage.
Unique Ratios: The ratios of adjacent cells are unique, e.g., if R1C1 is 1 and R1C2 is 3, then there cannot be any pair of (horizontally or vertically) adjacent cells that have a 1:3 ratio anywhere else on the grid.
Solution code: All digits in all cells, from top to bottom, and left to right, i.e., R1C1-R1C2-R1C3-R1C4-R2C1-...-R4C4.
Comments
on 19. September 2025, 21:36 by Exigus
Goodliffing and using the negative constraint made it pretty quick. Very nice snack. Thanks!
on 26. August 2025, 00:13 by SHERAX
It was easy….
on 24. August 2025, 02:24 by bumperchip
19:50 for me. i dont solve very often so this was a very nice puzzle to get me back into sudoku. thanks!
on 23. August 2025, 18:14 by MikeMeech
Super cool puzzle!
on 23. August 2025, 09:47 by cornflakes23
Very good and approachable. Note the sudpku app didn't recognise the correct completed puzzle for me. I was told 'uh oh, that's not the solution' and I spent longer trying to work out why than I did completing the puzzle. Only when I tried submitting the solution code on here did I realise I was correct all along.
Thanks for a great puzzle
on 23. August 2025, 07:50 by cornflakes23
Very good and approachable. Note the sudpku app didn't recognise the correct completed puzzle for me. I was told 'uh oh, that's not the solution' and I spent longer trying to work out why than I did completing the puzzle. Only when I tried submitting the solution code on here did I realise I was correct all along.
Thanks for a great puzzle
on 22. August 2025, 23:44 by e401
Once I embraced the negative constraint, it flowed like honey. Very enjoyable puzzle, Burak Alver.
on 22. August 2025, 23:43 by e401
Once I embraced the negative constraint, it flowed like honey. Very enjoyable puzzle, Burak Alver.
on 12. August 2025, 07:11 by geronimo92
Why only 7 solves here ?? This one is superb, not so difficult and the path is 100% logical !
on 23. July 2025, 09:36 by Burak Alver
Image updated.
on 7. March 2025, 13:01 by Burak Alver
SudokuPad link added. Rules clarified.
on 7. October 2024, 22:28 by Burak Alver
Link added.
on 7. October 2024, 22:00 by hardline35
link?
