Printable Hard Sudoku

Set v9jnu4. 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 4 1
3 6
3 2 1 9
7 9
9 4
5 1 7 8
3 6
2 3 9 5 4 7
6 2 8 4
Hard #2
9
7 9
3 8 9 5
1 3 5 8 9
4 5
8 6 1 3
7 3 1
6 4 5 3 7
9 8 1
Hard #3
7
9 1 4
7 1 2 3 5
8 4 5 3 9
3 2 7 5
4 6 2 8
1 5
4 5 3
8 9
Hard #4
5 2 3
2 3
7 1
9 4 7
5 1 4 9
8
6 5 2 7 3
2 7 3 6 4
9 4 6 7
Hard #5
5 3
2 8 9
4 9 2
1 6 7 4
9 4
4 2 5 7 9
1 3
5 2 3 7 1 4
2 6
Hard #6
9 1
6 8 2 7
2 1 6
5 4 6
7 5
6 2 7 9 4
7 9 3 5
4 8
2 6 3 7
Hard #7
9 8 3
7 3 2 1 9
6
4 3 2 1
5
4 7
3 8 9 1
2 7 8
5 8 2 6 3 9
Hard #8
3 5 7 8 4
9 1 7
6 5 3
6 8 7 2
9 3
2 5 7 8 6
5 4
4 7
1 3 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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