Printable Hard Sudoku

Set 13hsy1e. 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
1 5
1
4 2 8 6
4 3 5 6
2 9 6 8 3
6 3 1 9
3 9 7 6
1 7
6 4 3
Hard #2
2 5 8
2 3 9 8 5
5 1 6 9
8 6 2 1
1 6 8
5 8 1 3
7 4
6
9 3 5
Hard #3
7 6 9
7 2 4
9 5 6 7
8 9
6 4 3 5 2 8
5 7
1 9 6 8
8 5
6 4 9
Hard #4
2 9 4 5 7
8 9
5 7
1 6 2 9
5
8 7 3 2
3 7 2 6
8 7 4 3
2 5 8
Hard #5
7 9 6
6 5 3 4 7
8 4 7 2
6 2 8 3
5 3 8 6
9 4 7
3 2
1
9 1 3
Hard #6
2 6 8
7 9
1
8 1 7 3
3 4 8 2 1
6 9 7 1 5
6 7 4
7 8 3
9 6 4
Hard #7
6 9 7 8
7 4 6
4 5 9 2 1 7
9 6 4
5 3 1
8 5 4 7 6
5 8 4
1 2
Hard #8
5 7 9 6 2
1 7 8 4
9 8
8 6 3 2
9 7 3 5
3 8
9 2 3
2 4 5
9 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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