Printable Hard Sudoku

Set 1f0husn. 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
4 1 9
1 7 4 6
3 9 5 4 7 8
2 8 6 9 3 1
5 8
2
3 4 5
6 8 3 7
Hard #2
8 9 1 4
1 3 6
2 5 8
4 8 1
1 9 2
6 2 3
6 1 7
2 9 5 7
7 8 3
Hard #3
5 8 3 6 9
8 5
7 2 9
7 3
8 4 5 7
5 3 9 8 4
3 7
2 4 6
7 6 1
Hard #4
8 7 6
4 6 1 5 2
2 1 3 4 9 8
9 2 5 3
6 2 9
5 3 1
9
4 6
8 5
Hard #5
2
5 9 7 8 3
3 1 9 7 5
6 4
6 8 3 4
4 5 7
9 5 8
7 9 2 6
3 1
Hard #6
7 6 5
9 1 3 7 8 6
8 5
2 5 4
6 2 3
8 6
4 9 1
9 8 7
1 4 2 6
Hard #7
2 6 9 3 5
5 8 6 4
1 5
2
4 5
7 8 5 3 6
3 8 2 4
6
6 5 8 9 2
Hard #8
6 1 5
6 9
9 5 2 1
8
3 7 4 8
4 6 2 3
5 1 8 7 6 4
1
2 4 8 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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