Day 13: Black Kropki Dots
(Published on 13. December 2025, 06:00 by SharpFox)
Rules:
- Normal 4×4 Sudoku rules apply.
- White Kropki dots connect adjacent numbers and black dots connect numbers where one is twice as large as the other.
- There are only exactly two dominos with a 1:3 ratio.
Solution code: Column 2 (4 digits):
Comments
on 13. December 2025, 17:31 by madlil
Hard to understand the phrase: "There are only exactly two edges with a 1:3 ratio" had to guess for the last pair of 1 and 4. Maybe the rule should be "in a 2x2 box, 1 and 3 must always be diagonal of each other".
on 13. December 2025, 10:09 by wuc
For me the rule was understandable. Maybe simplify to exactly two dominoes? Great snack thx
on 13. December 2025, 07:59 by superkinkel
I really had a bit of trouble understanding what the last constraint is about and had to reverse engineer that (since my understanding that this refers to neigbouring digits on an edge proved impossible).
I’d rather write: There are only exactly two instances of cells on opposite ends of the grid with a 1:3 ratio.
