Printable Hard Sudoku

Set qphz82. 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 4 8 3
8 6 2
2 3 6
3 6 5
6 7 3
3 9 5 4 7
2 6
6 9 4
1 8 5
Hard #2
1 4 5 8
7 1 2
4 5 1
6 2
6 9 5
5 8 4
9 6 3
1 5 2
8 3 7 9 4
Hard #3
7 3 6
5 4
5 2
9 8 5 7 6
7
1 2 6 3
2 7 6 1 4 8 9
9 8 2
1 6
Hard #4
1 7 3 4 2
9 3
5
4 9 1
8 7 9
3 7 1
8 9 2
7 6 4 8 3
6 1 2 9
Hard #5
3 6 8
9 8 1 2 7
2 4
7
8 4 3 1
3 1 4 5
1 3
4 5 9 6
9 6 4 7
Hard #6
7 9 1 2 8
9 5 6
6 8 2 4
3 4 5
2 9 3 1
7 8 3
3 2 4
5
6 7 1
Hard #7
3 2
5
9 3 6 8
2 4 6 1
5 1 9
1 4 9 8 7
9 6 1 7
2 1 5 6
4 2
Hard #8
2 6 3
8 9
4 1
5 8 2 7
4 5 9
7 9 6 5
7 5 4
5 9 1
6 9 8 2 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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