Printable Hard Sudoku

Set ca1zqq. 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
4 6 9
8 7 4 6 5
3
9 1 5
8 9 4 7 1
3 4 8
6 5 2 4 7
1 8
6 1
Hard #2
7 2 8
2 6 1 9
9 7 2
9 4 5
8 7 1 4 3
9 6 2
9 7 2
2 4 8
4 8
Hard #3
1 3 8 9 6
2
2 6 5 4
1 2 3
8 9 5
7 5 2 1
3 7 1 4 8
4 8
8 1
Hard #4
9 6 8
8 1 3 9
4 3 2
3
4 9
9 7 8
4 5 3 9
1 2 5
6 8 3 7 9 4
Hard #5
6 5 1 7 9
7 5 4
1 4 6 2
6 7 3
3 8 6 9
2
5 7 6 1 3
1
5 2 8
Hard #6
1 6 3 9 4 5
1
8 7
1 8 6
4 7 9 2
6 7 4
4 9 1 2
1 9 3
7 5 1
Hard #7
7 9 3
7 1 2 6 5 4
6 3 2
2
3 1
1 4 6 2
5 3 4 2
4 6 1
7 9 3
Hard #8
2 1 5 3
9 5 8 6
6 3 7
5 7
1 6
3 6 1 7 8
8 2
1 2 8 6 9
7 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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