Hard sudoku — printable sheet 16
Four hard puzzles, one page. Answer key: view answers.
6
4
7
3
8
6
9
8
5
8
4
7
7
8
1
4
3
7
2
7
2
3
1
5
4
9
6
5
4
9
8
6
2
5
6
4
9
6
1
5
7
2
3
8
6
5
2
6
4
6
9
7
2
5
7
8
2
9
9
1
8
4
1
8
9
3
9
6
5
7
3
2
7
4
6
8
1
4
3
7
9
2
1
7
1
9
3
8
3
4
1
8
5
9
7
6
1
9
2
4
1
9
3
5
2
Sheet 16 of 20 · all hard sheets