Printable Hard Sudoku

Set 11dq9ou. 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
1 7 9 5 6
6 1 9 8
4 6 5
4 3 7
3 5 9
2 5 3
8 4 2
6 4 9 5
Hard #2
6 8 7 4
2
8 2 5 3 1
2 9 8 6
8 6 3 2 5
7 1
7 5 8
1 3
1 7 2
Hard #3
4 2 6
7 1 3
6 3 5 9 7
9 2 5 8
8 4 2
7 4
5 8
6 5 1
1 8 7 4
Hard #4
2 3 8
3 9 2
1 7 5
7 9 1 6
6 4 2
4 3 7
2 1 8 3
3 2 1
4 7 3
Hard #5
7 6
1 2 7 9 5
9 2
4 3 1
8 5
9 1 4 8
9 4 3
8 3 7 4 2
3 5 7
Hard #6
4 5
8 2 4 3
9 6 8
6 4 9 7
8 5
6 4 3
1 2 8
5 9 7
8 7 3 6 2
Hard #7
1 2 5
4 9
4 5 7
7 8 5 9
3 6
3 1 7 4
6 4 9 7 1 2
8 9
5 4 8
Hard #8
7 5
4 8 2 3
8 1 9 3 4
6 9 1
5 7
1 8 9 3
3 1 2 7
6 4 1
2 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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