Printable Hard Sudoku

Set 1asq41s. 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
5 4 2 8 6
9 5 2
9 6 5 7
3 9 7
3 9 8
7 4
4 2
7 6 9 1
8 6 7
Hard #2
1 4
2 8 3 5
5 2 7 6
6 4 2 8 7
3 4 5
1 5 4 3
7 6 9 8 2
4 8
Hard #3
4 6 9 1
3
9
1 2
2 5 1 7
4 8 9 2
9 5 6 8 3 4
3 2 4 6
5 3 9
Hard #4
4 3 8 7 9
5 1 8
8 9 4
9 4 2
7 8
8 6 2
1 3
5 4 2 7 1
7 5 4
Hard #5
2 3
6 7 5 4 1
5
4 6 7 1 8
1 5 6
8
8 4 2 3
1 6
5 4 6 9 2 7
Hard #6
1 3 8
5 6
6 5 7 8
3 7 8 9
8 2 7
1 8 3
2 5 6 7 9
5 3
8 4 9
Hard #7
3 2
9 8 6 1
8 1
7 3 4 5
2 1 8
3 4 7 2
4 8
2 6 7 1 3 4
7 5
Hard #8
2 1 5
7 6 2 9 3
9 8 7
1 7 3 4
5 9 8
5 3
8 5 7
4 2
3 4 9 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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