Printable Hard Sudoku

Set uq26qr. 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 8
6 4 2 7 9
5 1
5 4 1
6 7 9 4 5
3 6
3 4
6 3
7 2 5 6
Hard #2
9
7 5 6
6 4 9
4 5 2 6
1 9 8 4 5
5 3 4 7 1
1 8 9
6
8 2 9 5
Hard #3
5
6 9 2
8 2 1 6 5
1 5 4 3 2 9
9 4 5
3 1 8
2 7
1 7
9 3 6 4
Hard #4
3 5 8 1
9 2 4 5 6 7
3 2
2 5 9 4
1 8 7
6 7 9
4 2
2 9
7 3 2
Hard #5
6 9 5 3
3 2 4
4 7 2
1 4 3
8 9 6 1 5
5 7 2
7 2
6 5 9
8 9 4
Hard #6
6 4 7 9
2 5
3 1 7
3 7 8
9 8 1 3 6
3 2
7
6 2 8 5 1
1 6 9 8
Hard #7
5 6 1 8
1
2 6 7 4
9 6 3
2 4 7
4 6 3 5
3 2 9 5
1 8
8 5 9 4
Hard #8
5 8 7
9 8 1 4
6 1 5 8
2 4 8 6 7
7 3 4
2
9 1 6 8
7 4 2 3 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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