Printable Hard Sudoku

Set 8y332o. 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 3 4 8
2 9 6 7
5
2 9 4 3 5
8 3 2
5 8
5 2
6 8 1
1 9 3 6 2
Hard #2
3 5 6
3 8 7 9
7 1 3
2 9 1 5
8 4 2
3 9 7
9 4 7
6 5 2 9
1 6
Hard #3
6 1 3 7
2 1 9
3 5 8
4 1 6 3 5 7
1
7 3 8 4
9 1 4 3
6 4
2 6
Hard #4
6 4 3 1
7
9 4 1 2
5 1 6 2
8 5 3 4
9 2
1 3
1 7 9 6
3 2 8 1
Hard #5
6 2 5
7 5 8 2
3 1 9 4
2 6 1 9
1 8 6 2
4
6 4 9 3 2 8
8
5 6
Hard #6
8 1 6 7 9 4
7 9 5
7 8
3 2 6 1 5
5 6
1 9 8
1 5 9 2
2 6 3 1
Hard #7
2 4 8
8 3 7
5 9 3
2 8 1 3
1 7
6 8
9 7 6 1
3 6 5 9
9 5 6 2
Hard #8
8 4 9 6
3 4
6 5 2 1
6 9 1 8
2 8 5
2
4 2 6 1
2 5 8 9 4
1 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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