Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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