Printable Hard Sudoku

Set 3hi9v5. 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
1 5
9 8 1 5 7
2 4
7
3 9 6
4 7 6 1
3 6 4 2
2 5 3 9 4
9 8 5
Hard #2
9 4 5
4 8 2
2 1
9 3 2 5
7 5 1 6
2 3 4
6 9 3
9 6 7 2
5 9 7
Hard #3
6 1 4
3 5 8
4 7
1 9 5 2
9 3 7
6 2 3 1 9
4 3 5
1
2 9 6 8 4
Hard #4
8 5 2
3 1 4 6
6 5 7
4 7 6
2 5 8 1
3 5
3 2 4
7 1 3 6
3 6 9
Hard #5
5 6 8 9
4 7 9
1
6 7
8 2 4 7 5 3
3 9
9 1 3
1 5 3 6 9 8
8 1
Hard #6
5 8 9
4 8
7 6 9 3
9 3 6 1
2 6
1 9 3
9 3 8 4
7 6 1 9
4 5 6
Hard #7
5 8 6 9 3
6 9
7 5
9 3 1 8 2
6 9 1 8
4 3 5
3 2 5
1 8 9
4 5
Hard #8
6 4
5 8
4 3 2
7 8 5 4 9 6 1
3 5
6 5 7
5 6 7
3 1 9
2 1 8 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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