Hard sudoku — printable sheet 12
Four hard puzzles, one page. Answer key: view answers.
1
2
5
4
8
8
2
4
5
2
7
3
1
9
2
4
1
6
7
8
9
9
4
4
7
7
4
1
7
4
6
3
4
8
9
5
2
4
2
3
2
8
1
8
4
1
3
8
4
6
7
7
6
3
1
6
5
6
8
9
8
1
3
2
5
1
8
2
3
4
2
5
6
2
7
9
6
3
1
1
3
4
7
3
2
4
7
9
5
3
7
9
3
9
6
6
8
3
1
4
9
5
4
2
6
5
9
4
3
6
1
Sheet 12 of 20 · all hard sheets