Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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