Printable Hard Sudoku

Set 11jtviv. 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 3 6
8 6 9 5
5 8 3 1
4 8 6
3 9 1
7 5 8
6 8 9
9 5 2
1 2 6
Hard #2
6 9
5 8 2 9 4
6 4 8 1
7 2 3 1
6 1
4 9 6
8 9 3
4 1 5
6 3 2
Hard #3
8 6 4
3 6
6 2 5 3 9
1 9 2 7 6
5 7 4
5 3 4
6 1 2 8 7
2 6 1
Hard #4
1 6 7
5 9
3 8 9 1 4
2 7 9 5
9 5 1
5 8 3
3
4 3 2 8
2 8 4 1
Hard #5
4 3 5
5 2 4
2 8 7
6 3 9
7 8 2
1 5 6 3
1 7 6
5 9 1 7 4
8 6
Hard #6
7 2 4
9 5 7
6 7 8 4 5
3 6 2 7
8 5 3
7 5 8 2 1
9
7
8 3 1 5
Hard #7
8 3 9 2
2 7 4 6
1 9
7 2 8
5 7 6
8 6 4 3 1
1 7
6 4 5
5 8 9
Hard #8
8 6 2
5 7
1 7 2 4 8
4 1 7 9
6 9
5 4 1 6
6
7 6 2 9 4
5 4 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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