⚫ Kropki Sudoku

In Kropki Sudoku, a white dot between two squares means they're consecutive (they differ by 1); a black dot means one is double the other. If there's no dot, neither applies.

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📖 How to play Kropki Sudoku

  1. The sudoku rules apply: 1 through 9 with no repeats in each row, column, and 3x3 box.
  2. A white dot ⚪ between two neighboring squares means they're consecutive (differ by 1).
  3. A black dot ⚫ means one number is double the other (for example 3 and 6).
  4. Important: if there's no dot between two neighbors, they're NEITHER consecutive NOR double. The absence of a dot also gives you information. Each puzzle has a unique solution.

💡 Tip: the pair 1-2 is both consecutive and double; by convention it gets a black dot. Black dots with high numbers are rare (8 only pairs with 4).

📖 Want to master it? Read the full guide: How to play Kropki Sudoku: rules and tricks.