PlaySudoku.us
Hard · Puzzle #139
1
8
7
9
9
4
3
3
8
1
6
3
7
2
7
5
4
7
8
5
1
6
1
2
7
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