Hard Level 9 (28 clues)

谜题网址: http://cn.sudoku99.com/sudoku9x9/puzzle/122916/
网站: cn.sudoku99.com

1

4

7

5

2

8

4

3

6

5

7

8

3

8

1

7

2

7

6

1

5

6

7

5

2

3

4

1