Printable Hard Sudoku

Set 9zk8h. 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
8 7 9
7 4
4 2 5
1 5 3 4
9 5
4 6 2 3
7 5 6
6 1 8 9
9 3 7 1
Hard #2
6 1
3 8
4 1 3 6
9 1 8
5 2 4 3
1 8 6
2 3 9 1 8
6 7
4 2 6 5
Hard #3
2 4 8 6
3 6 9
7 1 8
2 7
9 3 7 4
6 4 5 3
5 9
8 4 3
4 2 6 1
Hard #4
1 2
6 1 5 3
7 1
7 8 6 3 4 2
4 8
8 9 1 7
4 7 3
1 8 5
8 4 5
Hard #5
8 1 2 9 5
4 8
7 6
1 7
4 7 8
8 2 3
8 6 9 7
1 6 9 4
7 5 2 6
Hard #6
6 3 7
5 2 6 7 3 8
4 3 9
9 2 6
7 6 1
3 5 9
8 6
8 9 1
7 6 5
Hard #7
2 9 7 6
2 4 1 5
8 1 7
6
6 3 7 5 8
5 1 3
3 4 6 2
6 5
1 2 4
Hard #8
7 5 3
6 8
1 6 2 3 7
2 9 8 1 6
8
3 5 9
5 2 4 9 6
8 2
9 6 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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