Printable Hard Sudoku

Set 9srd7e. 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
2 7 8
2
1 8 2 6
9 5 3 7
8 3 6
1 3 8
9 7 3 5
2 5
5 2 9 4 8
Hard #2
9
3 4 8
2 7 1
9
8 7 5
1 6 4 5 2
4 5 3 9
8 9 2 6 3
3 4 8 2
Hard #3
1 7 9 2
4 5 2 3 1
2 3 7
9
6 1 9 7
3 7 2
3 9
2 4 1 5
4 7 3
Hard #4
8 4 5
4 3 1
3 6 9
6
9 5 1
1 5 3 8 9
4 2 7 9 3
6 5 4 2
8 5
Hard #5
8 1 9
7 9 2
9 5 8 6 4
7 6 8
3 4
5 3 4
8
1 4 9 2
3 1 5 6 7
Hard #6
5 6
6 8 7
4 2
9 3 6 7
3 4 7 2 9 8
6 5 3
1 4
7 1 9 3
2 5 7
Hard #7
6 9 7
3 4 2 1
8 1
2 5 4 6 9
9 3 5
6
4 9 3
2 1 4
3 8 1 9 7
Hard #8
8 1 9
9 7
2 4 9 7 5 3
3 7 5
8 6
1 4
7 2 4
6 1 3 2
3 5 6 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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