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Sudoku

Fill every row, column and 3×3 box with 1–9. Four difficulty levels, every puzzle has exactly one solution — hints and notes included.

How to play: tap a cell, then tap a number (or use the keyboard on desktop). Each row, column and 3×3 box must contain 1–9 exactly once. ✏️ Notes marks small candidate digits; 💡 Hint fills the selected cell with the correct number.