Printable Hard Sudoku

Set v15al9. 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
7 8
1 8 5 4 2
3 7 4
5
2 7
6 9 1 5 3
5 2 9
7 1 5 3
4 6 8 1
Hard #2
6 3 1 9
1 2 6 5 8
9 4 3
4 8 6 2 3
7 8 1
5 4 9
7 1 5
2 3 6
Hard #3
6 5
1 9
7 3 2 1
7 6 2 8
8 1 7 4
4 7 2
8 5 4 9
4 7 1 8
3 2
Hard #4
3 8 5 4
8 2 3
4 5 6 2 9
6 4 5
2 1 9
7 9
3 1 6 4
4 2 5
6 7
Hard #5
6 3 9
1 9 2 3 8
8
5 6
6 4 1
9 7 3
6 3 4 7
2 4 7 3
3 8 2 4
Hard #6
1 3 9 4
2 5 9
9 7 6 8 5
9 1 7
5 6 1 7 8
3 2
5 1 2
9 6
4 3
Hard #7
5 6
6 7 4 1
9 1 6
7 8 9
1
5 9 2 6 1
3 4 9 1 6
2 5 8
4 2 9
Hard #8
5 6 4
6 2 9 7
3 8
9 7 5 4
6 8 2
8 9
7 1 4 2
5 1 9
9 2 3 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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