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9x9 Marked-Cell Sudoku

Kropki Sudoku

In Kropki sudoku, dots placed between neighboring cells give extra clues: a white dot means the two cells are consecutive, a black dot means one is double the other.

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Kropki Sudoku rules

  1. 1
    Rule 1

    The classic row, column, and 3x3 box rules apply as usual.

  2. 2
    Rule 2

    Neighboring cells with a white dot have consecutive digits (difference of 1).

  3. 3
    Rule 3

    Neighboring cells with a black dot have one digit that's double the other.

  4. 4
    Rule 4

    Neighbors with no dot between them are neither consecutive nor a double relationship.

Marked-Cell Sudoku more from this category

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Consecutive Sudoku

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