Hard sudoku — printable sheet 15
Four hard puzzles, one page. Answer key: view answers.
7
9
6
2
3
5
9
8
5
7
6
4
3
4
5
1
1
6
5
3
2
9
3
4
8
1
7
6
7
8
9
1
6
5
2
3
8
8
9
5
7
4
2
3
9
1
6
5
9
2
8
5
4
6
2
4
1
3
1
6
7
2
3
8
1
9
1
9
2
5
9
3
7
4
3
7
1
5
2
5
4
9
1
5
9
7
8
6
5
1
7
9
5
9
2
8
6
4
8
5
2
6
5
1
7
1
3
Sheet 15 of 20 · all hard sheets