6
9
7
3
2
1
8
1
4
9
3
8
3
1
9
6
5
4
3
8
1
9
2
4
7
5
8
7
1
9
7
6
4
5
5
1
9
7
2
7
9
2
3
6
2
3
6
7
8
4
1
How to Play
- Fill the grid so that every row, column, and 3x3 box contains the digits 1 to 9.
- Select a difficulty level to start a new game.
- Use the number pad or keyboard to fill in cells.
- Relax and enjoy the process.