Printable Hard Sudoku

Set 1iacbn3. 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
9 3 5 1 7
8 7
4 1 6 3
3 2 6 9
9 7 3 6
9 4
7 2 9
1 6 9
4 5
Hard #2
4 2
7 1 9 2 5
7
5 9 4
7 3 2 6
1 8
1 3 8 5
3 2 9
1 7 4 8 6
Hard #3
3 8 1 2 9
6 9 2
9 4 6
8
3 7 2 6 9
9 3 4
8 9 3 7
7 8 1
3 2
Hard #4
6
5 7
7 1 9 3 2
1 2 4
5 3
9 3 4 2 7 1
1 9 3
8 4 9
8 5 1 4
Hard #5
7 6 5 2
2 6 4
2 3
1 9 3
7 4 1 9
4 9 7 5
3 4
3 9 5 2
8 5 1
Hard #6
9 8 7
2 7 4 1 5
7 9
1 5 9 2
3
6 2 9
9 2 5
7 8 4 2 3 9
8 4
Hard #7
6 8 7 5
3 4 9 1
3
3 7 4 8 6 9
4 9 5 1
1
6 5 8 1 3
6 5
1 7
Hard #8
6 4 3
4 2
1 7 2 4
7 4
7 4 6 1 3 9
5 8 6
6 8 1
4 1 9 3
7 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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