Printable Hard Sudoku

Set 8n6cda. 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 9 4 2 1
3 7 5
8 5 4
8 6 9
4 5 3 7
2
9 5 1
3 4 8
9 2 3 6
Hard #2
9 7 6
2 5 4 1
1 3 6 2 7
6 9 7
8 3
2 3 7
6 5 4 1
8 2 5 6
5
Hard #3
1 6
4 5
8 5 7
7 6 1 9
4 5 8 7
1 6 4 2
4 1 2 6
2 5 3 1
6 9
Hard #4
9 5 3 2 7
7 3 5
2 3 6 5
1 3
2 4
2 1 4 9
6
7 6 1 3 9
9 4 2
Hard #5
1 7
6 1 4 5 8 3
2 8 5
1
7 3 2 1 4
6 4 2
7 4 5
6 9
5 2 7 8
Hard #6
9 8
5 6 3 1
2 8
6
7 4 9 5
7 4 1
7 2 9 8
3 6 2 5 4
9 5 6 3
Hard #7
4
3 2 4
5 8 9 2 7
8 1 5
1 2 6 7
9 5 4
7 3 2 1
3 8
7 1 6 8
Hard #8
5 2 3 8 6
6 2
2 3 1
1 9 5 3
6 3 5 9
9 8 1
2 3 4
3 7
7 9 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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