Printable Hard Sudoku

Set l5dxcy. 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
7 8 3
5 2 4
5 8 6 7
1 6 7 3
5 4 3
7 2 1 9 8 6
6 4
5
1 7 9
Hard #2
7 9
5 6 9
8 3 2 7
5 6 2
7 9 4
9 8 5 1
9 8 7 1
2 1
6 7 8 9
Hard #3
8 3
5 7 9 6 1
4 5 8 7
1 4 7 5 9
2 4
6 7 3
7 6 2 4
3 1 6
3
Hard #4
9 4 6 3
3 6 5 2
6 9 8 4
1 7 6
4 7 1
2 3 5
6 2
7 9
7 8 4 3
Hard #5
6 2 5 3
1 8 7 6
2 5 3 6 7
9 1 3
8 6 5
7 9 2 3 8
2 3 4
3 9
Hard #6
1 3 8 4
1 9 5 7
6 4 8 3
8 4 6
3 1 8
5 2 3 7
9 6 8 4
9 2 1
Hard #7
1 5 7 9
2 3 1 8 5
3 7 1
8 4 2
1 4 2 3 5
4 7 9 8
7
2 9 1 5
Hard #8
5 4
9 2 3
7 4 8
1 5 2
7 3 4 6
9 8
5 1 7 6 9
6 2 5 4
2 4 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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