Printable Hard Sudoku

Set 1nfk9w3. 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 5 2 6 9
7 2 3
7 6 4
6 4 2 1 8
9 1 8
7
1 7 5 4
5 9 1
4 7
Hard #2
8
3 9 5 4 1
1 9 5 7
2 9 7
5 7 2 9 8
6 3
1
6 7 3 9
4 8 6 5
Hard #3
9 1 4
3 5 6 7
4 8 7 9 5
5 4 6
4 3 8 5
9 7 1 4
9
6 7 3
1 8
Hard #4
5 6 3 8
4 1 6
6 9 7
7 8 2 3 1
7 8
9 3 2
2 7 5 4
4 7 1 6 9
Hard #5
7 3 8
2 4 1 9 5
8 1
8 7
5 4
8 7 1 9 5
7 8 2 3
3 6 4 7 1 8
Hard #6
3 1 2
1 7
5 6 1
7 9 6 4 8
5 6 3 9 2
8 7 6 5
6 7
9 3 4
7 8
Hard #7
8 1 9
8 3 7 2
4 6 1
7 6 2
6 1 5
4
2 9 6
4 5 6 3 2 7
8 1 4
Hard #8
2 7
2 6 5
7 1 4 8 3
8 1 5
3 8 4
9 1 7
8 3 9 7
5 6 2
9 2 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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