Logic Masters Deutschland e.V.

Kropki Detectors

(Published on 7. May 2026, 17:20 by Astr0creep)

This is my second sudoku puzzle, and this time I thought i would try my hand at a somewhat novel ruleset.
I have combined black kropki rules with detector cells and a negative constraint to produce the puzzle below.
I think it is quite difficult, but has some rather pleasing deductions. I would apreciate any feedback you may have in the comment section.
I hope you enjoy!

Standard sudoku rules apply:
Fill the grid with the numbers 1-9 with no repeats in any row, column or box.

Renban line:
Digits on the purple line form a consecutive set in any order without repeats.

Black Kropki (Invisible):
Black kropki dots seperate digits where one is double the other. These digits are part of a kropki domino.
All black kropki dots are given.
All black kropki dots are invisible!

Black Kropki Scanners (Blue Diamonds):
Digits on a blue diamond count how many black kropki dots are on that square (up to 4).
All blue diamonds are given.

Kropki Sweepers (Orange circles)
Kropki sweepers count how many of the digits in the surrounding cells, are part of black kropki dominos, including instelf (up to 9).
All orange circles are given.


Play the puzzle here:
Play on SudokuPad

Solution code: Column 9 from top to bottom (9 digits)


Solved by SKORP17, hoopsie, opengangs, blueberrypug, TVDK, GG_70, arctan
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Comments

on 12. May 2026, 00:42 by GG_70
Took me 2 hours, got stuck in box 4 but smooth sailing afterwards

on 7. May 2026, 22:25 by hoopsie
Really loved this rule set, unique and had some fun twists. Great puzzle, took me about 90 minutes, 4 stars feels about right.

Difficulty:4
Rating:N/A
Solved:7 times
Observed:0 times
ID:000SPH

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