Printable Hard Sudoku

Set ya4639. 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
8 1 6 2 5 7
7 9 3
3 6 8
3 4
9 3 7 8 5
8 4 9
5 8 6
5 2
2 1
Hard #2
6 9 8 1
6 4 9
2 3
8 1 3 9
7 3 2
2 1
6 9 5 8
3 7 4 6
3 2 9
Hard #3
5 1 2 9
4 6
9 8 5 2
4 8
1 8 7 6 5
6 9 2
1 3
9 6 8 2
7 5 8
Hard #4
6 5 8
9 1 6
5 1
2 5 6
8 6 3 4
3 6 8 7
2 3 6 5
6 4 1
9 6 7
Hard #5
2 9 7 1
5
3 8 2 6
5 9 7
6 1 5
3 2 4 6
6 7 5
9 5 2 1
5 6 3
Hard #6
3 1 7 6 5
5 4 9 3
8 9 5 4
6 5 3 1 4
9 3
3
2 4 6
9
1 7 6 2
Hard #7
9 4
1 9
4 9 2 5 6
6 7 3
2 1 9
8 3 4 2
9 3 6
1 5 8
5 8 4 1
Hard #8
3 2 1
2 5 9 8 4
7 6
4 8 6
2 8
5 4 9 7
8 5 1
5 6 2 8
4 3 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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