Printable Hard Sudoku

Set pk26zx. 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 5
6 4 2
2 7 8 9
6 4 5 3 9 2
3 8 1
1 3
6 2 1 8
9 2
5 7 4
Hard #2
7 5 3
9 1 3 2 8
6 4 5
2 9 4
1 8 9 7
5 7 6
1 2 3
8 6
4 1 2
Hard #3
5 3
8 1
6 2 8
6 8 7 3 9
7 9 8 5
3 4
9 4 3
3 2 7 6 8 4
6 9
Hard #4
4 2
3 4 5 6 7
2 3 1
8 1 9 2
8 4
6 9 1 5
9 3 8
6 8 7 3
7 6
Hard #5
4 3
8 9 6 3
1 3 8 6
5 8 4 6
2 1 9
6 9
6 4 1
5 9 3
4 2 5 8
Hard #6
6
2 5 7
4 7 8
6 5 2 9 4
5 4 3
2 9 6 5
9 2 7
1 2
7 1 8 3 5
Hard #7
2
9 5 3 4 2
1 5
6 9 3 5
6 7 9
1 4 7
8 9 2
6 2 5 3
9 8 7 1
Hard #8
3 7 8 4
7 3 1
1 6 4
9 2
4 5 8 6 1
3 7 1 9
2 4 3
5
5 1 8 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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