Printable Hard Sudoku

Set 1a32m08. 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 1 5 8
3 5 6 2 7
7 6
3 8 4 1
7 5 4 6
6 7 2
6
8 2 9 1 5
Hard #2
1 5
5 6 4
1 2
3 6 7 9 4
4 8 6 7
7 5 8
8 9 2
1 9 7
3 4 2 5
Hard #3
3
8 9 7 1
4 5 9 3
9
2 7 8 4
1 3 6 8
1
5 6 3 7 2
2 7 5 8 6
Hard #4
8 1 3 6
3 4
6 2
7 1 4 8 6
9 6 2
3 7 2
9 1 7 4
4 2 8 3 1
5
Hard #5
2
5 2 1 9
1 2 8 5
8 9 3
3 2 1 5 6 8
9 7 6
4 6 2
8 9 3 5
4
Hard #6
2 3 8 7
1 4 9 6 3
2
1 9 5
4 5 6
3 4 5 1 2
9
7 8 3 5
5 2 3
Hard #7
7 9 2
1 5 6
6 8 2 5
5 4 6 9
7 8
4 9 1 3
9 8
1 7 5
2 8 6 9
Hard #8
8 7 5 2 1
4 6 2
3
1 3 5
4 3 7 8
7
6
3 4 2 1 8 5
9 6 7 8 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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