Printable Hard Sudoku

Set 9z77n4. 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
5 1 9 2
4 3 5
8 2 1
5 8 7
9 4 6
3 6 8 1
1 8 9
7 9 6 2 3
Hard #2
1 5 7
3 9
6 7 1
5 3 8
7 1 8 6 5
6 4
2 7 9
9 5 6 1
7 6 1 2
Hard #3
3 6 7 1
1 5 2 4 6
5 8 7 3
9 7 6
8 9
8 4 3
1 3 8 2
5 9 8
7
Hard #4
8 5 1 3
7 3 6 4
6 3 9
3 5 6 9
1 9 4 2 6
9 1
5 3 7 6
4 8
7
Hard #5
5 9 7
8
8 2 1 4
4 7 1
7 5 9 1 6
1 5 3
4 6 2 7
1 3 8
9 8 6
Hard #6
3 9 5 6
6 4 7
1 4 5
9 3 6
8 9 1
3 7
1 7 3
5 6 3 1 4
8 5 2
Hard #7
8 1 9
7 6
3 2
4 2 5
1 9 3 8 4
3 8 7 1
5 1 6 4
9 4 5
2 6 8
Hard #8
7 2 5
2 6 5 9 1
5 9 8
7 8 1 9
6 5 1
1 3 6
1 5
9 3 1
3 8 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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