Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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