PlaySudoku.us
Hard · Puzzle #680
8
7
3
1
2
4
9
9
7
3
8
4
1
9
1
2
6
8
8
1
6
7
2
4
6
7
5
"Everything should be made as simple as possible, but not simpler." — Albert Einstein
"Everything should be made as simple as possible, but not simpler." — Albert Einstein
"There is no permanent place in mathematics for ugly mathematics." — G. H. Hardy
"There is no permanent place in mathematics for ugly mathematics." — G. H. Hardy