Hard Level 9 (28 clues)

谜题网址: http://cn.sudoku99.com/sudoku9x9/puzzle/0716547/
网站: cn.sudoku99.com

7

3

3

4

9

8

1

1

4

9

4

7

6

5

1

2

9

3

5

1

8

6

1

3

2

4

7

5