Kropki Sudoku

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1
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9
8
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1
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8
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6
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1
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9
8
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7
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5
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7
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9
1
Errori
0/3
Punteggio
-
Tempo
00:00
Nuova Partita
Progresso0%
Facile · Kropki Sudoku Cambia difficoltà sopra ↑
Come giocare a Kropki Sudoku
Si applicano le regole standard del Sudoku. Punto nero tra due celle adiacenti: una cifra è esattamente il doppio dell'altra. Punto bianco: le due cifre sono consecutive (differiscono di 1). Nessun punto: nessuna delle condizioni si applica.
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Punti bianchi = cifre consecutive; punti neri = una cifra è il doppio dell'altra

Cos'è Kropki Sudoku?

Kropki Sudoku posiziona punti tra coppie di celle adiacenti. Un punto bianco significa che le due cifre differiscono esattamente di 1 (consecutive). Un punto nero significa che una cifra è esattamente il doppio dell'altra (ad es., 2 e 4, o 3 e 6). Dove non appare alcun punto, nessuna delle due condizioni si applica. Alcuni puzzle Kropki usano il 'vincolo negativo' in cui l'assenza di un punto garantisce che nessuna delle due condizioni valga, dando ancora più informazioni.

A Colpo d'Occhio

Tipo di vincoloRelazioni tra Celle
Dati tipici18–24
Valutazione della difficoltà ★★★☆☆ 3/5
Tempo medio di risoluzione — Facile8 min
Tempo medio di risoluzione — Medio18 min
Tempo medio di risoluzione — Difficile35 min
Tempo medio di risoluzione — Esperto62 min

Come Risolvere Kropki Sudoku

TecnicaCosa faLivello
White Dot Pairs White dots mark consecutive digit pairs: (1,2), (2,3), …, (8,9). Cross-reference with row and column constraints. Avanzato
Black Dot Pairs Black dots mark double-relationship pairs: (1,2), (2,4), (3,6), (4,8). Only these four combinations are valid. Avanzato
Negative Constraint No dot between two cells means they are neither consecutive nor in a 1:2 ratio — a powerful elimination on every unmarked adjacent pair. Avanzato
Dot Chain Analysis A sequence of connected dots forms a digit-value chain. Enumerate valid digit sequences for the entire chain simultaneously. Avanzato
1-2-4 and 2-4-8 Chains A black dot adjacent to a white dot often forces the common 1→2→4 or 2→4→8 chain. Avanzato

Tempi Medi di Risoluzione

Facile
8 min
Medio
18 min
Difficile
35 min
Esperto
62 min

Domande Frequenti

Cos'è il 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.
Prova Anche
XV Sudoku
Both mark adjacent-cell relationships with a powerful negative rule — XV's sum markers play exactly like kropki's dots.
Consecutive Sudoku
Isolates the white-dot half of kropki: bars mark consecutive neighbours and silence means never consecutive.
Sudoku Maggiore di
Adjacent-cell relationships again, but as inequalities — order information instead of difference and ratio.
Sfida Quotidiana