Printable Hard Sudoku

Set sh9e83. 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
3 8 6 1 5
2 8 9
7 3
6 1 4 2
3 2 9 6 1
5
6 5
5 2 4
4 8 1 3
Hard #2
8 9
4 6 9
1 4 6 7
7 5 8 9 4
5 1 8 2 7
3 4
5 6 2 1
8 5 7 6
Hard #3
9 6 1 5 7
2
2 1
8 1
5 3 7
4 5 9 7
5 3 2
2 7 8 4 9
8 4 6 7
Hard #4
6 8 2
5 1
5 9 3 1 6
4 7 9 5
2 5 1
7
4 1 6
3 7 8 9 1
2 9 4
Hard #5
5 4 3 7
3 2 6 9
8 9 2 6 3
8 1
6 1 7
2 3 8
3 8 1
3 5 4
6 9
Hard #6
3 5 1 6 8
9 7
2 3 9 6
3 7
6 5 1 4
7 5 9
8 5 6
3 8 9
4 7 1
Hard #7
6 3 7 2
4 6
7 9 5 8
8 5 2
4 3 8 1
5 1 7 3
9 1 2 4
1 5
6 9
Hard #8
9 4
7 8 3 2 5
4 1 3
9 6 7
6 5 1 8
6 2
4 7
4 1 5
5 6 3 9 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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