Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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