Sudoku

1. Start with 6 × 6 easy. Tap an empty square, then choose a number below the board.
2. Use 1 to 6 in the small puzzle, or 1 to 9 in the larger puzzles. Each number appears once in every row, column and outlined box.
3. Red numbers show a repeated number. Erase to try again, or use Hint for one correct answer.

Example: a row with 1, 2, 3, 4 and 6 is missing 5.