PlaySudoku.us
Easy · Puzzle #660
4
1
9
7
8
2
6
8
4
3
1
7
9
9
7
6
8
1
6
9
7
6
9
4
2
9
3
6
7
2
8
1
5
4
1
4
6
7
9
5
3
7
2
6
7
3
1
9
Check columns before rows — columns are often harder to complete and contain more useful constraints.
Check columns before rows — columns are often harder to complete and contain more useful constraints.
"Extraordinary claims require extraordinary evidence." — Carl Sagan
"Extraordinary claims require extraordinary evidence." — Carl Sagan