Sudoku
Classic Sudoku with four difficulty levels, pencil notes, hints and a daily puzzle. Every puzzle has exactly one solution. Logic
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How to play
- Fill the grid so every row, column and 3×3 box contains the digits 1 to 9 once.
- Tap a cell, then tap a number. Use Notes to jot down candidates.
- Three mistakes end the game. Hints and undo are there if you get stuck.
Controls
- Touch: tap a cell, then the number pad
- Keyboard: 1–9 to place, arrows to move, Backspace/Delete to erase, N toggles notes
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