Printable Hard Sudoku

Set 1y5oxz7. 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
1 9
6 4 8 1
3 4 8
5 8 1
3 9 7
6 2 5 9
3 4
7 9 1 6 2
5 1 3
Hard #2
4 1 9
7
2 6 4 3 1
1 4 7 5
9 7 5
4 6
5 9 6 4 7
3 1 8
2 1 6
Hard #3
9 3 2 7 5
7
5 1 6
6 2 5
7 9 6 1 4
4 8 9
8 2 7 4
4 5 9 3
3
Hard #4
6 8 9
1 7
8 7 4 5
7 6 8 4
8 3
5 1 6 9
3 2 5
4 2 3 6
9 4 3
Hard #5
8 2 3 9 1
3 4 9 2 7
9 8 6 5
4 9 3
6 3 1
9 3
6 3 7 5
7 5 9
Hard #6
7 6 5
9 2 4
5 9 1 2
6 1 2 8
3 4 5 9 2 1
9 3
6 7 3 4
2 5
1
Hard #7
6 9
7 5 4
5 8 4 7 2
4 7 3
3 9 4
7 5 4 1
9 7 8 3
2 8 9 5
3
Hard #8
1 5 6
6 2
1 6 5
6 4
7 8 2 9
9 3 2
5 3 9 1 6
8 1 7 9
1 6 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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