Printable Hard Sudoku

Set 1oqsf5i. 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
7 3 8 9
4 6 3
5 4 8 9 7
7 3 2
1 4 6
5 9 6 2
1 7 6
2 8 4
Hard #2
1 6 2 4
6 7 3
2 5 1 7
3 9 6
7 4 2
8 6
3
5 3 7 1
2 7 9 5 4
Hard #3
8 2 3
5 8 9 7
6 1 5
2 7 3
9 3 2
1 4 7 9
7 6 8 3
8
4 9 1 8
Hard #4
7 4
6 2 3
7 3 5 6
6
5 9 7 4
8 4 3 9
5 9 1 3 2
2 3
3 1 8 9
Hard #5
9
1 7 4 5 6
2 9 5
9 1
3 5 2
7 3 4
3 8 1 5 9
5 8 1
6 9 1 7
Hard #6
3 2 4 5
6 5 9 3 8
8 4 6 9
4 6 1 7
4
3 5
9 1
2 7 3 6
1 4 6
Hard #7
5 6 1
5 9 2
8 1 6 9
3 9
9 1 5 7
1 6
4 2 7 3
7 9 8
8 3 6 7
Hard #8
1 7 4
4 6 2 7 8
9 6
3 2 5 7
1 6 9
2 3 9 5
4 1 7
8 6
2 9 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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