Moons
(Published on 6. January 2025, 18:30 by Strosahl)
Normal sudoku rules apply
Quadruples: Digits in circles must appear at least once in the 4 surrounding cells.
Kropki: White dots connect cells that are consecutive. Black dots connect cells that have a 1:2 ratio.
All possible kropki dots surrounding quadruples are given. In other words, in the four connections between cells around a quad clue, all possible white and black dots are given. Other kropki dots elsewhere in the grid may or may not be given.
https://sudokupad.app/3bx3bbn3vz
Solution code: Row 5, left to right
Comments
on 9. January 2025, 03:02 by OGRussHood
A smooth and fun exercise in negative constraints.
on 8. January 2025, 14:23 by Karitsu
SanFranSam and I were in the same boat. I had a pencil mark saying a cell couldn’t be a particular digit, and MUCH later thought, “But why not?? Oh, I was incorrectly applying the negative constraint.”
on 7. January 2025, 07:25 by jhow25
Enjoyed it!
on 7. January 2025, 03:53 by SanFranSam
Almost started applying the negative Kropki rules to the non-quad cells. Whew!;)
on 6. January 2025, 22:31 by Ragna
Fun puzzle! Very nice idea. Thank you. :-)
on 6. January 2025, 22:24 by josemadre
Clever!
on 6. January 2025, 21:36 by GeorgeTheToad2
Welcome back Scott, love the simple rule set and it has some lovely tricks. Thank you.
on 6. January 2025, 20:57 by Deklok
Suprise how many deductions you can make with these rules. Great puzzle thank you
on 6. January 2025, 19:43 by hardline35
Very nice challenge. Thank you!
