Printable Hard Sudoku

Set 1n1oaoh. 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 4 9
3 1 5
8 6 4 3
7 2 8
8 1 9 6 5
9 1 7
6 3 7
2 1 3
7 6
Hard #2
2 1 4
4 6 7 9
7 8 4 3
3 6 9
1 8 9
7 5 6 8
3 2 7
9 5 3 2
4
Hard #3
6 1 2
2 7 4
1 4 3
7 8
2 4 5
3 4 7 6
3 2
2 8 4 5 3
9 3 2 7
Hard #4
1 2 7 4 8
9 4 8
6 9 7 3
6 2
3 5 1 2
7 1 6
9 5
3 2 4 6
4 1
Hard #5
5 9 6 3
3 8 4 2
1 4
6 2
9 8 6
1 4 5
4 5 3
3 8 7 4
2 7 1 9
Hard #6
2 5
1 2
8 3 5 9
8 7 5
7 1 8 9
3 1
6 4 7
5 8 4
4 2 1 7 5 6
Hard #7
5 6 8
1 2
7
4 7 5 1 3
5 9 4
3 6 2 5
9 8 7 4 2
2 8 1
6 4 9
Hard #8
6 1 4 9 2
2 9 5
5 7
3 2 8 4
7 8 4
2
6 5 2
9 8 1 4
8 2 9 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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