Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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