Printable Hard Sudoku

Set agl755. 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
6
6 4 7 3
3 9 4 2
8 5 3 9 6 2
7 3 8 5
2 4
4 8 1
9 5
8 3 6
Hard #2
2 8 4 5
1 3
4 7 8 3
1 8 2 4 9
9 2 4 7 3
1
4 1 8
6 4 9
9 4
Hard #3
3 7 8
6 4 5
5 2 4
3 8 6 2
1 2 7 3
7 9
8 4 7 5
3 6
7 4 8 3
Hard #4
1 6 2 3
3 5
7 1
2 8 6 1
4 9 2
5 7
6 9 7 8 4 5
5 9 8 4
5 4
Hard #5
6 5 1
8
3 2 4 5 8 9
4 1 7 9
2 5
3 9
7 6 1 2 4
3 1 6
1 4 2
Hard #6
4 6 3
9 7 8 5
1 8 4
5 4 3
1 7 6 2
2 3 1
7 9 1 3 6
5
5 7 8
Hard #7
5 2 1 8
8 6 5 3
3 8 4 7
3 2 5 1
7
2 1 4 7
7 3 9
2 5
9 3 8
Hard #8
7
8 3 1
4 8 3 2 7
7 2 1
2 4 9
4 5 1
5 3 2
9 8 4 6
6 2 7 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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