PlaySudoku.us
Hard · Puzzle #855
2
1
4
3
6
9
5
1
9
7
3
2
2
4
5
6
7
8
4
5
3
8
2
1
4
5
"What we know is a drop; what we don't know is an ocean." — Isaac Newton
"What we know is a drop; what we don't know is an ocean." — Isaac Newton
"To ask the right question is harder than to answer it." — Georg Cantor
"To ask the right question is harder than to answer it." — Georg Cantor