Printable Hard Sudoku

Set 9c6gxs. 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 9 8 2 5
7 1 6
5
3 1 7 8 9
4 7 6
4 1 8
4 3 8
1 2 9 4 7
5
Hard #2
1 6 4 2
4 5 3
2 9
5 1
2 3 4 9 7
9 4 5 6 1 8
4 7 3
6 7
8 7
Hard #3
7 3 4
6 7 8
4 2
5 1 6 2
7 4 8 5
9 2 3 4
9 2 4
4 9 6
5 2 3
Hard #4
3 5 9
6 2 9 5 8
7 2 6 1
8 2 1
7 2 3 1
3
2 9 3 1
6 2
8 5 7
Hard #5
8 6 2 1
2
8 9 3
7 1 5 4
4 9 2 3 6
2 6 7 8
2 1
4 7 1 6 9
9
Hard #6
6
2 7 1
2 1 4 9 3 6 8
7 2 9 1
6 5 1 8 9 7
3 5
3 7
1 8 5
2
Hard #7
1 9 4
3 2 5
4 8 2
7 6 1 8 9
3 9 8
9 7 4 6
9 4
2 3 5
1 9 6
Hard #8
1
4 7
1 2 9 3 8
9 2 6
2 6 5
5 6 4 3 8
5 6 2 1
9 1
7 4 3 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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