Printable Hard Sudoku

Set nasxz9. 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 1 5
6 3
9 3 2 1
4 1 6
7 1
6 7 1 9 8 2
7 2 8
8 6 2 1 3
4
Hard #2
7 5
6 5 1 3
4 2 6 3 1
8 7 5 1
4 3
4 6
3 5 1 6
2 7 1
9 8 5
Hard #3
6 5 1
4 8
1 9 2 6 5
6 1
7 1 2 3 9
6 7
2 7 9 4 6 8
9 6
5 2
Hard #4
8 2 1
2 6 3
9 3 4 1
1 5 3
8 7 9 5 6
7
1 9 5
5 1 4 8
8 4 7
Hard #5
1 3 8 5 6
5 3
7 4 8
6 7 5 3
8 2 1
5 4 2 9
6 1
3 9 7 4
6 9
Hard #6
2 3 8 1
7 5 1 3
8 4 3
6 9
7 4 3 5
5 2 6
9 2 4 5
8 5 2 3 1
Hard #7
8 2 5 7
5 7
6 3
8 1 7 4 2
8 7 1
7 2 1 8 6
3 4 8
6 3 5 7 8
Hard #8
1 7 6
6 3 1
2 1 7 9
9 3 7 4
9 3 8
4 8 3 2
6 8 2 9
5 7
7 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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