Hard sudoku — printable sheet 19
Four hard puzzles, one page. Answer key: view answers.
4
8
5
2
9
2
5
4
5
6
3
1
7
6
9
3
1
6
4
9
8
5
4
2
6
7
6
8
3
7
2
3
5
6
8
1
4
5
3
7
6
9
4
1
5
9
5
7
9
1
6
8
5
4
7
9
3
6
1
6
5
1
4
2
7
1
7
8
5
7
4
3
1
4
2
7
9
4
6
5
5
2
2
3
6
2
2
7
4
9
1
7
5
3
6
5
5
6
9
8
2
Sheet 19 of 20 · all hard sheets