Printable Hard Sudoku

Set 1bh3oxr. 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
6 8 3 4
3 6 9 4
1 4 7 8 6
1 5
7 2 9
9 5
6 2 8 5 7
7 3 6 2
Hard #2
4
3 6 5 1
9 5 4 2 8
9 3 6
8 4 5 3 9
7 2 4
7 3 5
8 1
3 7 5
Hard #3
1 9 8 7
3 1 9 8
6 1
8 2 6 3
2 7 1 5
5 3 1 2
7 5
9
8 5 2 6
Hard #4
7 2
5 9
6 1 8
8 5 4 6
6 3 1 8
9 5 4
1 7 5
6 7 9 4 8
1 5 3
Hard #5
4 8 5
5 1
9 3 5
5 3 6 7
6 1 2 4
7 3 5 6
6 3 1 4
4 6
3 9 7
Hard #6
5 2 7
6 1 5 4
2 7
1 7 3 4 8 5
5 6 7 2 1
4 9
1
1 7 3 9
6 8
Hard #7
8 1
2 4
3 7 9 5
6 8 2 4 7 3
7 8 6
2 5 1 4 8
1 9
6 4 3
1 7
Hard #8
9 8 7
5 4 3 9 6
1 5
4 2 6 5 7 8 1
9 4 6
5
1 3 2
8 4
5 7 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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