Play Asterisk Sudoku Online Free

Play Asterisk Sudoku online for free. Standard sudoku rules plus 9 specific cells in a star pattern around the centre must contain digits 1–9.

▶ Play Asterisk Sudoku — Free
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How to Play Asterisk Sudoku

  1. Standard Sudoku rules: rows, columns, and 3×3 boxes contain 1-9.
  2. PLUS: 9 specific cells in a star/asterisk pattern around the centre must also contain digits 1–9.
  3. Asterisk cells (1-indexed): R2C5, R3C3, R3C7, R5C2, R5C5, R5C8, R7C3, R7C7, R8C5.
  4. The pattern is 180°-rotationally symmetric around the centre.
💡 Pro Tip
The centre cell (R5C5) lives under FOUR constraints simultaneously — row, column, box, AND the asterisk region. It's almost always the most constrained cell on the board.

Frequently Asked Questions

How many cells are in the asterisk region?

Exactly nine — they form a star or snowflake pattern around the centre cell. The 9 cells must contain a complete 1-9 permutation.

Is Asterisk Sudoku harder than X-Sudoku?

Similar difficulty — both add a single 9-cell region. The asterisk shape distributes the constraint more evenly across the grid than two diagonals do.

Try More Puzzle Modes

🧩X-Sudoku (Diagonal Sudoku) 🧩Windoku (Hyper Sudoku) 🧩Classic Sudoku 🧩Jigsaw Sudoku
▶ Play Asterisk Sudoku