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Sudoku
Fill the grid so every row, column and 3 by 3 box holds the digits 1 to 9 once. New puzzles are made on the spot at three levels.
How to play
- Tap an empty square, then tap a number (or type it on a keyboard).
- Each row, column and 3 by 3 box must hold 1 to 9 with no repeats.
- Switch on Notes to jot small pencil marks instead of an answer.
- Check shows squares that do not match the solution. Reveal a cell fills in one square for you.
Levels
Easy gives you more starting numbers. Hard gives you fewer and needs more careful logic. Every puzzle has exactly one solution.