Printable Hard Sudoku

Set 1ool0r6. 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
4 6 2 7 8
2 9 4
8 6 4
5 6 4 2
2 6 1
3 9
9 8 5 4 2
5 7
3 8
Hard #2
8 9 3
4 1 6
2 3 1 7
5 4 2 1
8 5
1 5 6 8
9 4
6 1 2
8 9 6 3
Hard #3
4 2 5
7 4 3 2 6
8 6 9 1
3 6 5
6 1 9 7
9 2 1
5 8
5 7
8 3 2
Hard #4
4 7 9 6
7 8 5
5 2 3
2 6 5
6 4 7
7 3
2 5 6 1
4 3 1 9 7
1 6
Hard #5
9 6
6 4 8 5 2
7 9
2 6 1 8
8 5 6 1
7 8
9 1 4 3
7 6 2 8
9 7
Hard #6
9 7 3
2 7
2 6 9 5 4 3
2 1 4 9
6
4 2
8 6 9
3 6 1
8 7 5 2 1
Hard #7
2 9 5 8
4 9 3
7 4 6
9 4 8
3 2 6
9 5 1
1 5 6
2 1
6 7 1 3 2
Hard #8
3 1 5
8
2 1 3 7 9
8 4
6 4 9 3 7 8
8 4
1 6 4
2 9 1
8 4 9 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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