Printable Hard Sudoku

Set 3c9qpw. 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 1 7 2
9 6 1
3 1 7 8
7 2 5 3 1
4 9 2
5
2 9 4 1
7 5 6
1 9
Hard #2
1 7 5
3 6 5
9 4 3
4 7 6 5
4 8 6
6 1 8
7 9 1 8
5 8 3
3 1 2
Hard #3
1 7 5 9
7 6 3
1 3
2 7 4 8
8 1 7 5
9 5 4
2 3 6
8 9
1 7 5 6
Hard #4
3 4 5
8 7 5
9 8 4
7 4 9 8
5 2
3 2 8
4 1
9 7 5
1 5 8 3 6 4
Hard #5
2 8 3 1
3 4 6
3 8
1 3 9 7
9 6
6 2 1 4
1 2
6 9 7
3 9 2 6 5
Hard #6
5 7
1 2 3 8
8 9 5 4
9 1 3 5
2 9
7 4 9
3 2
4 1 7
3 8 4 6 7
Hard #7
4 9 3
7 3 1
7 9
7 2 1 9 5 8
5 7 6
2 9
2 7 4 6
3 2 9
6 8 5
Hard #8
1 9 7 3
3 6 1
7 9 2
4 5 3 7 2
9 2 3
3 8
6 5
4 3 9 6
1 7 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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