Printable Hard Sudoku

Set nfltf5. 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 4 3 8 7
2 5 9
1 2
7 5
2 3 8
9 4 2 1
1 9 7
4 6 2 8
3 9
Hard #2
6 8
1 3 6
9 8 5
5 9 1
5 2 6 4
2 5 8
1 3
3 8 6 9 1
1 5 4 8
Hard #3
2 7 3 6
3 4 7 9
2 4
5 8 1
6 7 5 9 1
7
4 7 5 8
1 3 4 7
8 9
Hard #4
7 3 5 9 8
1 3 4 8
8 7 5
8 9 2 4
4 3
4 9 8 7
2 1
1 7
3 5 9
Hard #5
6 9 4 1
4 8 7
3 7 4 5
7 1 9
3 5 4
5 8 1
2 6 9
5 6 9 3 4
3
Hard #6
6 2 4 5 1
4 8
4 1 9 7 6
8 7
2 6
3 6 5 1 9
7 8 2 9 6 5
5 8
Hard #7
3 6 8
6 4 3 5
5 7 3 1 4
3 9 6
1 3 7
2 6
9 8 1 3
3 4 6
9 5
Hard #8
2 4 3
9 3 8 6
1 8 5 9 7
7 2 6
5 3 7
5 1
5 8
5 1 6
1 8 2 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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