Printable Hard Sudoku

Set p1ab6h. 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
7 8 4
1 6 4 5
5 3
4 8 7
5 6 9
8 1 7
1 3 7
8 3 9 2
9 8 1 6
Hard #2
6 8 1 5
5 4
9 1 8
2 7 4
5 1 9 7
9 5 6 1 2
8 6 9 2
7 3
7 6
Hard #3
3 6
5 2 7
8 9 7 4
8 9 3 6 7
7 4 2 8
9 2
2 9
1 5
9 3 6 7 1
Hard #4
5 6 7
7 6
3 2 1 5 4
4 8 3 9 7
6
5 9 1
9 8 1 4
1 2 7
2 9 5
Hard #5
6 1 5
6 4 3 1
7
5 8 1 9
3 4
7 1 2 3 8
1 9 7 5
8 2
2 9 5 1
Hard #6
4 8 6
3 7
2 8 7 5
9 5 2 8 1 3
6 3
3 1 5 6
9 6 2
1 6
6 5 7
Hard #7
1 8 3 5
7 6 2 1
1 4 7
3 7 8
9 1 3
4 9 3
2 5 1 7 8
8 4
1 9
Hard #8
9
9 1 2 4
4 8 7 6 3
6 1 3 2 7
9 5 1
4 2 9 3
2 7 6
8
5 4 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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