PlaySudoku.us
Hard · Puzzle #698
5
9
8
7
9
7
3
4
8
8
2
7
4
9
5
8
2
5
3
7
9
3
4
4
9
1
5
5
1
6
"A theory that is not refutable by any conceivable event is non-scientific." — Karl Popper
"A theory that is not refutable by any conceivable event is non-scientific." — Karl Popper
"In the middle of every difficulty lies opportunity." — Albert Einstein
"In the middle of every difficulty lies opportunity." — Albert Einstein