Printable Hard Sudoku

Set 5vu85c. 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
7 6 9
3 9 2 6 7
4 8 9
7 6 1
6 5 4
4 9 6 3 7
8 4 9
6 2 1
Hard #2
9 6 2
3 1 9 4
7 3 2
9 1
2 5 6 7
6 8 2 9
5 6 3
1 8 7 3
6 5
Hard #3
9
8 9 5
7 3 6 2
5 9
5 1 7 4 3
1 6 3
7 6 1
5 2 4
2 3 8 4 1
Hard #4
7 3 5
4 5 1 8 9
6 8 2
8 7 2 1
9 8
7 6 4
1 7 4
6 8 4 9 1
2
Hard #5
1 9 6
3 6 7
4 2 3 1
4 8 2
5 7 8
8 7 4
1 5 3
7 8 1 9 5
7 8
Hard #6
9 2 5 4
6 3 5
8
7 6 3
4 7 1
6 1 5
6 5 9 1 7
9 3 4
2 5 6 9
Hard #7
8 5 7 1
7
9 6 3 5 2
1 2 9 7 3
6 3 1
4 8
5 1 2 3
4
6 3 1 4
Hard #8
6 4 7 5 2
1 9 8
5 3 6 1
9 3
8 7 5
3
4 6 2
2 6 7 4
8 7 5 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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