Medium Level 7 (30 clues)

谜题网址: http://cn.sudoku99.com/sudoku9x9/puzzle/489791/
网站: cn.sudoku99.com

3

7

8

6

9

5

7

4

8

4

7

8

6

1

6

1

2

3

4

8

2

5

4

1

4

8

1

2

1

6