Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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