🪟 Windoku

📖 How to play Windoku

1. The sudoku rules apply: 1 through 9 with no repeats in each row, column, and 3x3 box.
2. In addition, the four extra shaded boxes (the inner 3x3 squares) must also contain 1 through 9 with no repeats.
3. Click an empty square and choose a number. Each puzzle has a unique solution.

💡 Tip: shaded squares carry one extra constraint, so they're usually the best place to start deducing.