Sudoku
Easy
Medium
Hard
7
6
5
2
3
2
5
6
3
8
8
4
1
1
9
5
9
6
7
4
7
9
5
8
3
9
9
5
7
4
Undo
Erase
Pencil
00:00
1
2
3
4
5
6
7
8
9