Medium Level 8 (29 clues)

谜题网址: http://cn.sudoku99.com/sudoku9x9/puzzle/677587/
网站: cn.sudoku99.com

5

1

4

2

3

8

9

6

3

1

7

2

8

4

6

1

7

4

7

2

9

8

5

1

9

3

5

7

6