4
9
7
2
6
4
8
7
9
6
8
1
9
6
2
9
7
4
5
2
6
3
1
9
2
7
3
8
6
5
7
Sudoku became a global phenomenon in 2004 after The Times of London started publishing it daily.
Sudoku became a global phenomenon in 2004 after The Times of London started publishing it daily.
Sudoku became a global phenomenon in 2004 after The Times of London started publishing it daily.
Sudoku became a global phenomenon in 2004 after The Times of London started publishing it daily.