Printable Hard Sudoku

Set 1ppc7fn. 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
8 3
5 1 3 7 9 2
9 1 8
6 7 3 5
2 7
2 4 6 9
9 3 4 8 5
8
6 9
Hard #2
2 7 4 6 8
6
7 4
1 8 2 7 9
3 8
8 6 1 2 5
4 9
2 1 3 9
9 3 2
Hard #3
5
7 2 9 8
2 4 7 3
5 7 1
4 7 3 9 6
2
3 8 4 5
6 5 7
7 5 8 3
Hard #4
5 3 1
5 7 3 9 6
1 3 6 5
5 4 8 9 1
2 9 8
8 6 2
5 9 1 4
7
2
Hard #5
1 7 8
4 7 9
6 2 5
8 3 7 9
4 5 6 7 8
1 6
8
3 5
8 7 4 3 1 2
Hard #6
5 1 4
3 8
6 3 5 7
7 9 2
1 6 7 2
5
9 7 4 3 8
4 8 7 1 2
2 9
Hard #7
6 8 2 3
1 4
7 9 5
8 6 7 2
4 1 8 3
2 5
2 3 8
6 7
9 8 5 3 1
Hard #8
4 9
3 7 2 1 8
6 9 3 1
3 9 2 7 4
1 9 6
6 7 8
5 4 2 6
2 5 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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