Printable Hard Sudoku

Set 9sl801. 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 3 4
2
9 8 1 4 7
7 3 1 6 5
7 3 9
8 2 4
1 2
4 5 2 9 1
5 6
Hard #2
6 8 7 4
3 5 8
2 4 6
7 6 2
2 1 9
5 7 1
5 9 8
4 3 7
6 8 7 9
Hard #3
9 3 2 7
1 5 8
1 8 9
7 2 6 3
8 3
9
3 5 4 6
5 7 9 2 3
6 9 7
Hard #4
3 9 1 5
2 6 7
9 3 2 4
7 6
8 2 1 3
1 2 7
7 8
4 8 2
1 7 9 6
Hard #5
7 8 9 3 1
9 5 7 3
2 4
6 1 7
1 9
3
1 4 7
4 3 7 9 5 1
2 5 8
Hard #6
5 1 2
1
2 6 3 9 8
3 9 8 4
6 8 2 9 7
1 2 5 3
4 3 8
1
4 1 5
Hard #7
5 2 8
1 4 7 8
1 6 2 9
9 7
8 6 1
2 5
4 8 9 1
4 8 7
2 3 8 5
Hard #8
4 1 9
6
1 9 6
4 1 8
1 9 3 7
3 2
6 4 3 8
5 9 6
4 9 1 5 7 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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