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