Medium Level 8 (29 clues)

谜题网址: http://cn.sudoku99.com/sudoku9x9/puzzle/788172/
网站: cn.sudoku99.com

7

3

5

5

2

4

1

1

2

6

8

9

3

3

2

6

7

4

2

5

9

6

6

4

3

9

9

3

7