Printable Hard Sudoku

Set pc7ofb. 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
1 3 8 6 4
5 7
4 6 1 3
3 7
7 4 5 2
5 6 9 1 8
2 6 1
6 7
2 5
Hard #2
2 4
4 3 1 5
8 3 7 6
3 7 5 9 1
1 5 3
8 9
1 4 6 2 5
8 5 6
4
Hard #3
6
8
4 9 5 2
4 9 5 6 1
9 1 3
1 8 4 9 5
7 2
4 9 1
6 4 2 5 3
Hard #4
5 7
6 9 1 7
4 1
7 8 6
4 7
8 1 3
9 5 4
2 7 5 8 4 6
1 8 6 9
Hard #5
9 4 3 2
1 8 3
6 9 7
4 1 6
2 3 7 4
2 6
3 8 7 5
7 5 1
4 6 9
Hard #6
3 1 9 5 6
6 5 7
4
2 6 3 7 9
7 1
9 5 4
2 4 9 6
8
5 6 9 7 3
Hard #7
1 2 3
7 1 8
6 4 9
3 2 6 7 1
5 8
5 7 9
6 4 3 7
5 8 3 9
9 2
Hard #8
1 8 4
2 9 3
6 9 7
7 6 5 2
5 4 3 6
9 4 1
4 6 5
9 5 1 2 4 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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