Printable Hard Sudoku

Set 91b855. 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
4 3 2
5 6 9 1
7 1 9
8 3
4 3 7 6 8
1 5 7
1 2 4 8
7 3 8
Hard #2
1 5 6 3
3 7 9
3 9 2
5 8
8 1 2 3
7 1
6 2 9 1
7 1 8 4 3
3 6
Hard #3
6 2 8
5 9 4 7
3 8 2
8 5 3 6 1
5 6
1 7
7 1 9 2
6 5 8 4 3
9
Hard #4
7 3
9 1 6 8
6 8 1 4 9
3 8 6 5 1
2 7 4 8
1 9 3 5
6 1 4
4 7
Hard #5
7 8 3 4
5 1 7
4 8 9
1 9
2 7 8
3 2
3 8 5 4 2
1 8
5 6 7 2 3
Hard #6
7 6
3 4 5 2
8 7 3
1 8 2
9 6
9 2 6 7 3
3 2 8 9
2 5
7 1 4 3
Hard #7
3 4 7 2
6 3
3 9 4
2 4 9 7 8
3 7 2 9
9 5 8
2 3
5 6 1 2
3 7
Hard #8
7 2 4
9 8
1 5 8
5 7 3 9
3 4 8 9 2 1
9 8 7
1 7 3
3 2
6 8 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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