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