Printable Hard Sudoku

Set qmlm66. 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
7 1 9 6
8 6 2 3
3 4 8
2 1
8 7 2 1 4
9 8 5
6 8 9 1 4
3
4 7
Hard #2
9 5 4
6 2 4
4 1 9
5 8 9
9
4 8 6 2 1
6 2 7 9
1 7 8
9 5 6 1
Hard #3
8 6 2
2 5 9 7
9 6 1
7 8 2
4 2
6 2 7
7 6 8
3 1 9
4 3 9 8 1
Hard #4
4 8 7 5 6
5 8 2 9 4
6
2 7
4 9 1
3 4 7
7 9 1 3 8 6
3 1 6 7
Hard #5
8 3 6 4
9 1 2 4 7
3 4 7 2
3 5 1
4 8 1
7 6 2
9 6
2 9 5
2 1
Hard #6
3 4 5
1 3 4 6
9 1 8
6 9 4
4 5 9
7 5 1
6 9 3 7
7 8 5 2
4 3
Hard #7
1 4
4 5
7 1 6 4
8 2 5
6 7
2 7 4 6 8 9
9 3
8 2 4 9 3
4 8 6
Hard #8
4 5 7 2
2 4 3 1
7
1 7 9 3
7 8
8 5 6
2 3 8 1
4 2 6 7
9 6 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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