Printable Hard Sudoku

Set hqn9ij. 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
3 9 6
4 5 3 7
7 3
5 9 8 7 6
4 8 7 6 2 9
2 9
3 2 8
3
1 4 3
Hard #2
7 8 1
9 2 4 3
8 7
1 9 4 7
6 4 1 5
5 3 9
1 4 3
3 7 5 6
2 5
Hard #3
8 2
7 5 3
1 3 8 5 4
4 9 1 7
8 9
6 9 2 3
6 4 7 8
1 5
8 1 5
Hard #4
3 4 2 8
5 9 8
4 7 3 5
3 7 2 4
5 9 1
6 3 7
1 8 5 2
9 7
6 2
Hard #5
3 8 5 2 1
5 2 4 9
8 6 4 2
2 5 3 9
7 3 8
6 2 3 1
2 4 1
5 7
Hard #6
8 1 9
9 4 8 6
5 8 9 1
4 6 8 1
5
2 3
3 9 4 2
5 3 1
7 6 4 1
Hard #7
7 8 2 5
2 4
6 8 9 3
3 7 8
4 3 1 9
5 7
6 1 9
5 2 1
8 5 3 2
Hard #8
4 2 6
6 8 7 5
9 5 1 8
7 3 9 2
7 4 2
8 4
1 4 3
9 4 8
8 9 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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