PlaySudoku.us
Hard · Puzzle #331
3
1
6
7
6
8
1
4
7
8
9
1
5
7
6
1
4
8
2
1
5
6
2
1
3
1
7
4
7
6
The Times of London received so many reader letters about Sudoku in 2004 that they had to hire extra staff.
The Times of London received so many reader letters about Sudoku in 2004 that they had to hire extra staff.
"I think, therefore I am." — René Descartes
"I think, therefore I am." — René Descartes