Printable Hard Sudoku

Set 1p7lxv4. 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
5 6 8 7
7 8 3
1 3 6
5 3 6
5 2 8 9
3 1 2 4
9 2 4
4 6
3 5 6
Hard #2
5 3 9 2 1 4
6 3 4
5 1
2 3 9 5
7 8 1 3
3 8
5 1
7 8 4
9 1 6
Hard #3
1 9 2
8 9 7
4 1 5
9 6 3 2 5
7
5 6 8
4
8 1 9 4 3 7
2 8 6 1
Hard #4
6 2 5
4 2 1
4 9
1
9 2 1 7 3
8 4 9
1 2 3
7 5 9 6
4 6 8 1 7
Hard #5
7 9 2
1 6
9 4 1
9 5 2 1
8 7 9 3 1
7 8
2 6 3
5 3 6
3 1 5 9
Hard #6
1 5 6 8
5 7 1
1 8 3 7
5 2 4
7 6 4 8
2 3
9 3 6 2
5 4
4 7 1
Hard #7
3 1
7 4 1 2 3
5 7 4
4 6 1
2 1 6 5 9
6 2 3 4
8 2 9
7 4 8 9
Hard #8
7 8
2 7 9
2 8 4 9
6 7 3 5
1 6 3
2 1 7
8 3 7 9
6
5 9 6 8 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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