Printable Hard Sudoku

Set nzdzr5. 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
9 4 1 6
8 6 7
2 5 8
2 5
6 7 8 1
6 4 2
4 8 3 1 2
5 3
2 9 6
Hard #2
3 1 7
1 3
6 2 4
4 1 3 5
8 5 2
5 2 3 1 6
5 2 9
7 9 6 5
1 8
Hard #3
4 7 9
8 5 1 6
9 5 1
5 8 4 3
6 5
1 8 2
4 3
8 7 1 6
2 1 8 7
Hard #4
4 5 3 6
2
6 3 9 7
6 7 1 2 3
4 6
6
6 1 4 5 8 7
7
8 5 2 6 1
Hard #5
9 2 7
1 9 5 7
8 2 3
1 5 3 6
9 8
6 8 9
7 5
4 1 3 7
3 4 1 6
Hard #6
8 2 1 7
9 3 7 5 2
5 7 3 9
6
3 5
2 9 8 6
4 3 6 8
1
9 2 3 5
Hard #7
5 6
7 4 1
7 9 1 3
3 1 8
2 7 3
2 9 4 1
2 4 7 6
9 8
2 1 8 9
Hard #8
9 2 8 4
4 1 5
9 8 6 7
1 3 6 2
2
5 9 3 8
2 7 1 6
4 1 3
9 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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