Printable Hard Sudoku

Set pp1waf. 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 3
5 6 8
6 9 4 3
4 2 9
8 1 5 4 9
4 8 2 5
7 4 5
2 7 6
3 7
Hard #2
1 9 2
4 6 3 9
3 4 7
6 3 9
1 4 7
5 6 3 1
8 4
5 2 8 6
9 2 3
Hard #3
7 8 9 3
6 1 2
8 2 1
3 6
6 5 2 7
1
2 5 8
7 4 8 9 1
8 9 7 4
Hard #4
9 2 7 3
8 1 7 6
1 7 4 8
3 7 6 4
4 8
9 5 8 1
2 1
8 5 9 4
3
Hard #5
8 3 6 5
4 7 8 2
2 7 5
4 9 8 7
3
2 6 5 4
5 8
4 1 2 5
2 5 1
Hard #6
8 2 3 7
9 3 1 5 6
6 7 9
3 7 9
4 9 3 8 1
1 2
4 8 2
1 7
5 9
Hard #7
5 6 8 1
8 9 6 7 3
6 2 4 3 7
7 6 8
1 2
2 3 6
8 5 7 2
5 9 8
Hard #8
9 4 2 6 8 5
8 1
5 1 3 6
3 1 9
3 6 4
4 1
2 3 7 9 6
9
9 2 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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