6
9
1
1
8
4
2
3
7
7
8
1
4
8
3
6
3
2
7
3
5
9
4
1
8
7
6
5
9
9
5
There are Sudoku World Championships held annually, with competitors from over 30 countries.
There are Sudoku World Championships held annually, with competitors from over 30 countries.
There are Sudoku World Championships held annually, with competitors from over 30 countries.
There are Sudoku World Championships held annually, with competitors from over 30 countries.