Printable Hard Sudoku

Set 1kmx7n3. 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
7 9 8 4
3 5 8
9 5 1 6 8
2 1 9 5
3 9 1
2 3
2 8 5
6 7 4 9
Hard #2
2
5 9 4
9 4 5 8
6 8 7 1
7 2 9 3 4
6
4 3 1 9
2 1 3 6
5 3 2
Hard #3
2 4
9 1 4 2
7 3 8
3
6 4 2
4 7 8 9 3
4 3 5
5 9 6 4 3
8 6 7
Hard #4
5 6 7
9 6 2 7
1 3 5
1 9
4 2 6 5
5 9 3
2 6 1
9 5 8
7 8 1 9
Hard #5
5 6 1
3 4 1 9
8 7 9 5 4
8 2 4
8 3 2
5 7
2 3
7 4 9
3 5 6 7
Hard #6
2 3 7 5
5 3 2
9 4 1
6 2 4 8 3
2
8 7 6
8 9 4
7 4 1 2
9 5 7
Hard #7
8 3 1
5 3 7
7 6 8
1 2 4 5
5 6 8 9 1
7 3
4 2
2
9 2 3 5 1 7
Hard #8
1 6
5 2 3 6
3 9 4
7 2 6
8 3 7
9 4 1 5
2 3 5
9 3 6 1 7
5 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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