Printable Hard Sudoku

Set 1nj0prf. 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
6 2 1 3
1 5 3 8
7 4 2 6
5 7 8 9
8 3
3 9 2 4
1 6 7
5 3 8
3
Hard #2
5 2 7 1 3
3 9 7
2 5 9
6 8 7 2
8 5 1
4 3
9 8
9 2 6 1
5 4 3
Hard #3
2 4 3 8
9 2 6
6 9
8 7 2
7 9 3 1 4
2 6 7
1 9 5
4 3 5
6 4 1
Hard #4
6 2
1 6 4 5
5 1 9
2 3 4
9 5 8
6 7 4
5 1 6 8
1 2 3
2 8 1 6
Hard #5
6 5 8 9
2 3 5 1
3 4 7
9 7 2 8 3
8
5 1 9
9 6 2 3 7
6 8
1 2
Hard #6
9 8 2 3
8 6 7 2
4 9 8
9 1 7
7 4 3
9 3
4 1 6
3 7 8
6 2 4 9
Hard #7
2 1
8 3 6 5
2 8 9
7 2 1
6 9 7 8
9 4
7 9 4 3 8
2 9 8 4
5 6
Hard #8
9 5 7
2 7 1
3 8 4
5
6 7 9 4
2 7 4
9 6 8 5 3
3 1 6 8
5 6 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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