Fill the 9×9 grid so every row, column and 3×3 box has 1–9 exactly once.

• Click a cell, then click a number 1–9 (or use the keyboard).
• Wrong entries are highlighted red.
• 3 hints per game reveal a correct cell.
• Easy / Medium / Hard each have a unique daily puzzle.
• Faster solves rank higher — time is the score.

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