Hur man spelar Kropki Sudoku
Vita prickar = på varandra följande siffror; svarta prickar = en siffra är dubbelt så stor som den andra
Reglerna
Standard Sudoku-regler gäller: fyll varje rad, kolumn och 3×3-ruta med siffrorna 1–9, var och en förekommer exakt en gång.
Kropki Sudoku placerar prickar mellan par av intilliggande celler. En vit prick betyder att de två siffrorna skiljer sig med exakt 1 (på varandra följande). En svart prick betyder att en siffra är exakt dubbelt så stor som den andra (t.ex. 2 och 4, eller 3 och 6). Där ingen prick visas gäller inget av villkoren. Vissa Kropki-pussel använder den 'negativa begränsningen' där frånvaron av en prick garanterar att inget av villkoren gäller, vilket ger ännu mer information.
För var detta pussel kommer ifrån, hur det jämförs med relaterade varianter och en strategisammanfattning, se vår Kropki Sudoku variantöversikt.
Översikt
Hur man löser Kropki Sudoku
Vanliga frågor
Vad är Kropki Sudoku? ▾
Kropki Sudoku is a variant where dots appear between adjacent cells. A black dot means one of the two cells holds exactly double the value of the other. A white dot means the two cells hold consecutive digits (differing by 1). Standard Sudoku rules apply, and crucially: if there is no dot between two adjacent cells, they are guaranteed NOT to be consecutive and NOT to have a double relationship.
What does a black dot mean? ▾
A black dot between two cells means one digit is exactly twice the other. For example: 1&2, 2&4, 3&6, 4&8. Note that 1&2 satisfies both black (1×2=2) and white (|2-1|=1) conditions — in Kropki Sudoku, a black dot is used when only the doubling relationship holds, not the consecutive one, unless specified otherwise.
What does a white dot mean? ▾
A white dot between two cells means the digits differ by exactly 1: they are consecutive. Valid pairs are 1&2, 2&3, 3&4, 4&5, 5&6, 6&7, 7&8, 8&9. The order doesn't matter — either cell can hold the higher or lower digit.
How does the no-dot constraint work? ▾
In standard Kropki Sudoku, every possible black dot and white dot relationship is marked. This means that if no dot appears between two adjacent cells, you can be certain those cells are neither consecutive nor in a 1:2 ratio. This negative information is just as powerful as the positive dot clues.
Is Kropki Sudoku harder than regular Sudoku? ▾
Easy Kropki puzzles are accessible and make excellent teaching tools for the variant. Hard and expert puzzles are significantly more challenging than classic Sudoku because you must simultaneously track dot relationships and the negative no-dot constraint across every pair of adjacent cells.
How long does Kropki Sudoku take to solve? ▾
Easy puzzles take 8–18 minutes. Medium puzzles run 18–35 minutes. Hard puzzles average 35–65 minutes and expert puzzles often exceed 90 minutes. Mastering the no-dot constraint is the key to faster solve times at all levels.