PlaySudoku.us
Hard · Puzzle #601
8
9
7
6
7
8
4
6
9
1
4
3
6
7
3
2
5
9
2
7
1
7
5
5
6
9
7
9
4
After placing a digit, immediately check its row, column, and box for new naked singles.
After placing a digit, immediately check its row, column, and box for new naked singles.
If pointing pairs aren't visible, try box-line reduction. They're inverses — if one fails, try the other.
If pointing pairs aren't visible, try box-line reduction. They're inverses — if one fails, try the other.