Printable Hard Sudoku

Set 9is0yn. 8 puzzles with an answer key, ready to print.

Hard puzzles start with about 29 givens and need real techniques: pointing pairs, naked pairs and hidden pairs. Paper is a great way to practice them, because you have to keep your own notes honest.

Each free PDF has 8 puzzles, four to a page on US Letter paper, plus an answer key with every solution. Every puzzle has exactly one solution. A new set appears here every day, or you can grab a different set any time.

Puzzles in this set

Hard #1
6 9 8 5 7
1 6 9
7
3 4 7 2
6 2 5 9 7 1
4 5
2 8
4 2
9 3 5 6
Hard #2
1 8 2 7
3 6 4
7 3 1 6
5 7 6 9
2 6 3
7 2
6 7
7 6 3 2
4 1 8
Hard #3
8 9
2 4 7
8 4 3
8 6 9 5 4
2 7 9 5
9 4
1 6 2
7 2 3
3 1 6 9
Hard #4
6 7 4 5 2
5 1
6 9 4
2 6 7
3 2
7 3 5 9 8 4
8 1
4 6 3
5 7 6
Hard #5
2 3 8 1 4
7 9 8 6
8 4
1 6 9 3
7 1 6 5
5 7
3 2 5 4
4 9 1 2
Hard #6
4 7 9
8 3
2 5 1
7 1 4 9 5
5 8 2 6
7
1 6 3
6 8 7 1
3 7 5 4
Hard #7
4 5 2 3
8 4
7 9
8 1 3 4 5
4 8 1
7 3 6
7 8
6 2 1 5
5 3 6 9
Hard #8
7 8
5 6 9 4
4 3
4 7 2
1 3 9
8 2 7 4
5 6 9 8
1 9 7 6 5
8 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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