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About game
Sudoku 9 is a classic number logic puzzle. Fill the 9×9 grid so that every row, column and 3×3 box contains all the digits from 1 to 9. Four difficulty levels, a daily puzzle, notes, hints, stats and achievements. Dark and light themes, multiple languages.
How to play
The goal is to fill the 9×9 grid with the digits 1 to 9 so that each row, each column and each 3×3 box contains no repeated digits.
Controls:
• Tap an empty cell, then pick a digit 1–9 at the bottom of the screen.
• "Notes" (pencil) — write several possible candidates into a cell.
• "Hint" — reveals the correct digit in the selected cell.
• "Erase" — removes your digit; "Undo" — reverts your last move.
• No more than 3 mistakes are allowed per game.
On a computer: keys 1–9 to enter, arrow keys to move, Backspace to erase, N for notes, H for a hint.
On phone and tablet — touch controls.