PlaySudoku.us
Hard · Puzzle #582
4
2
1
3
7
8
1
5
6
8
7
2
1
4
2
4
7
5
3
7
8
2
3
1
3
7
"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