Logic Masters Deutschland e.V.

Day 13: Black Kropki Dots

(Published on 13. December 2025, 06:00 by SharpFox)

Regarding yesterday: I wanted to briefly demonstrate the uniqueness aspect in the large Sudoku puzzle. For me personally, this is part of the standard Sudoku rules. So when I write: Normal 4×4 Sudoku rules apply, I implicitly mean that there must be a unique solution. Nevertheless, I can understand if you see it differently. But now to today: SudokuPad
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.
Have fun!

Solution code: Column 2 (4 digits):

Last changed on on 13. December 2025, 20:25
Solved by MaxSmartable, pippilotta, marajade, YoooDeej, tiuhto, KlausRG, JTurnquest, sacklunch, jalebc, superkinkel, Dee_Code, Majesteit, Zzzyxas, SanFranSam, Gizmo, Lonzz, meiwanmeiliao, wuc, marcmees, ... hyea, Counterfeitly, jade23, Lysine, ManuH, MattConco, abadx, ffricke, ElecCatMon, stafen, hampterss, ethteck, Morisenseiisgod, EnotiAndy, Kenji769, marsigel, geronimo92, mmmead, RadchenkoAleksandr
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Comments

Last changed on 13. December 2025, 21:17

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.

Difficulty:1
Rating:77 %
Solved:202 times
Observed:1 times
ID:000QJ8
Sudoku

Enter solution

Solution code:

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