Printable Hard Sudoku

Set 9cyau3. 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 9 4 6
7 3 5
7 4 8
3 2 8 9
1 4 6
5 4
8 4
9 5 1 2
2 6 9 8
Hard #2
7 1 8 2
4 8
9 1 7
9 4 7
7 6 8 1 3 5
2 7
4 6 1
5 3 6 7
8 4
Hard #3
3 2 8
5 2 1 7
7 2 6
7 8
2 3 7 8 1
8 6 5 7 2
4 9 2
1 6
7 3
Hard #4
8 7 6 4 3
7 8
1 9 5
3 9 7
6 9 3
5 2 6 9
2 4 9
1 6 7 2
9 5
Hard #5
3 1 7 6 2
6 5 8
4 3 7
8 7
2 6 9 5
6 9
4 1 3 9
7 3 2 4
4 1
Hard #6
7
1 5 4 6 2 3
3 2 7
4
8 9 3 6
7 9 5 3 8
3 8 6 4
5 7
7 1 9
Hard #7
8
4 5 6 8
3 4
2
9 3 6 5
4 9 1
3 8 6 1
1 7 9 8 2
9 4 5 3 6
Hard #8
1 4
4 7 1 9
5 7 8
7 8 9 5 6
2 9 4 3
5 6 1
4 8 2 7
9 8 1
3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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