Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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