Printable Hard Sudoku

Set opzt95. 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
4 7 2 5
5 6
1 9 6 3
5 2
5 7 1
2 3 1 5 9
2 9 1
8 9 2 7 1
4
Hard #2
4 1 2
8 7
6 1 3 8 9 5
1 7 6
6 2 1 7
5 2
2 9 1 8
2 9
9 4 3
Hard #3
5 3 4
9 2
3 7 9 6 8
7 5 1 3
3 6 9 4
7 1 3
8 5
6 1 4
9 7 1
Hard #4
6 2 7 8
2 5 6
3 4
5
9 4 2 5
7 8 4 2
1 8 3
7 1 2 8
3 4 7 5
Hard #5
6 2 4 8 5
3
3 2 6 4 8
4 8 6 5 7
1 3
9 2
1 8 7 2 4
2 5
7 1
Hard #6
1 3 4 7
8
4 2 1 5
9 8
7 8 9 4 1
4 2
9 3 1
2 5 1 7 9 3
7 8
Hard #7
9 6 5 8
8
2 9 6 1
7 6 9
1 9 3
9 5 1
7 1 4 8 3
6 4 7
4 2 5
Hard #8
2 9
2 5 7 8
4 7 5
2 1 3 6
7 9 5
3 6 7 4
1 3
9 4 8 2
7 6 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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