PlaySudoku.us
Hard · Puzzle #636
1
8
5
7
7
3
2
6
2
7
4
6
5
4
9
6
8
2
5
3
1
9
8
1
9
7
"In mathematics the art of asking questions is more valuable than solving problems." — Georg Cantor
"In mathematics the art of asking questions is more valuable than solving problems." — Georg Cantor
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.