Printable Hard Sudoku

Set 1h9j9q6. 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 5 2
4 2 3 7 8
3 6
2 6 4 1 8
5 3 9 2
5 8 1
7 9
2 5 3 9 7
Hard #2
4 8 5
9 2 1 7
1 7 3
4 9 6
9 6 8
6 8 5 2 4 9
5 1 2 8
5 6 9
Hard #3
3 1
7 2
1 3 7 6
8 9 7
5 7 9
1 3 4
4 6 2
9 4 8 5 1
1 4 8 9
Hard #4
3 1 2
8 1 5
9 8 4
6 2 8 4
1 6 8 3
5 7 6
7 6 2
9 5 1 3
1 9
Hard #5
1 2 4
6 8 4 5
5 9
3 1 8
8 5 6 4
7 4
3 6 4
7 2 3 6 8
5 3 1
Hard #6
2 6 5
1 8 2 7
5 3 8
7 3 2 5 1
2 6 1 9
9 1 5 4
9
8 2 3
3 8
Hard #7
7 9 4 6 2
5 4 6 8
6 3
1 8 2 4
9 8 3
9 8
1 2 6 5
2
7 5 9 3
Hard #8
8 3 4
7 9 3
1 5
8 2
9 8 2 4 6
7 4 2
4 6 1 8
6 8 5 9
7 1 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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