Printable Hard Sudoku

Set qw9s37. 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 4 5 8
2 9
5 2 3
4 8
3 1 7
8 1 2 7
1 5 9 6
9 4 3 5
6 2 9
Hard #2
8 7
8 5 9
5 4 2 3
1 2
7 9 5 1 8
6 7 3 9
4 1 7 5
1 2
9 2 3
Hard #3
3 7 9 8 5
7 8 3
8 6 4 2 1
6 3
2 1 8 7 4
5 8
2 6
9 3 4
7 1
Hard #4
3 2 1 6
5 9
9 3 1 8 4
2 6
1 3
9 8 1
5 3 7 9 6 8 2
4 3
4 5
Hard #5
5 3
3 2 4 5
1 5 9
4 7 8
8 6 9 1 4
2 3 6 5
9 6 5 1
5 8
8 3
Hard #6
9 1 8
8 5 2
1 8 4 2
4 7 9
3
6 7 5 9
9 3 7
5 6 7 8 9
9 1 2
Hard #7
9 3 7 5
3 9 6 4 1
2 6
7 9 3 1
3 9
4 8 2
6 7 4 3
6 9
8 1 5
Hard #8
7 2 8 5 3
4 1 6
1 4
9 8 5 7
4 6 2 7 3
3
2 8 4
7 5 1 3 6
9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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