Printable Hard Sudoku

Set lh7c6z. 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 8
4 8 5
5 7 2 4
9 7 1 3
2 3
5 6 3 2
7 5 3 6
4 3
2 4 9 1
Hard #2
3 4 1
5 9 1 8
7 4 3
8 6 9 2
5 6 4 7 3
8
4 3 9
7 2 4 9
6 8
Hard #3
9 7 6 1
4 3 5 9 8
1 8 3
8 2 1
2 3 7
6 8
7 5 3
2 8 6 7
5 2
Hard #4
1 5 6 8 7 4
6 7 3
9 5
5 1
8 3
4 1 6
2 3
3 7 9 8 1 5
5 9 2
Hard #5
4 7
7 5
8 1 4 3
1 7 2
4 8
6 7 5
9 1 7 6 5
2 7 4 8 6 1
6 3
Hard #6
7 5 9
4 8
5 6 4 1
8 4 2 3
5 2 4 3
6 3 5
8 1 7 6
2 5
6 7 9
Hard #7
2 9 8
1 9 3 6
6 2 7
6 5 8 2
7 6 3
8 1 3
3 9 7 4
7
4 5 3 9
Hard #8
1 3 5 6 9
2 7
8 5
3 6 8 1
1 3 8 7
7 6 4 1
7 8
4 3 2
3 6 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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