Printable Hard Sudoku

Set shd9tb. 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
9 7 1 2
2 6 1 8
6 3 5
3 4 8
5 6 7 4
2
5 3 2 7 9
9 5
7 2 3
Hard #2
9 1
2 8 7
7 6 5 8
1 3 6 7 5
9 2
6
2 4
4 7 1 9 5
2 5 4 6 1
Hard #3
4 3 1
9 3 6 5
7 8
5 4
8 2 4 6 7
9 6 1
2 9 6
6 4 2 9 1
7 2
Hard #4
2 4 7 3
5 1 7 8
5 4
1 9 5
3 7 4
9 2 6
1 4 8
9 2 5
5 6 8 1
Hard #5
9 5 6 8
5 4
8 2 4 3
8 4 9
1 8
3 9 7 6 1
3
2 7
4 7 5 3 9 6
Hard #6
3 9
4 9 8 7
1 6
7 3 6 1 5
3 4 8
1 5
6 4 2
2 8 1
7 8 6 4 3
Hard #7
5 4 8
7 2 3 1
7 9 3
5 4 7 8
3 7 2
1 5 4
2 9 4 3
6 4
8 1 5
Hard #8
8 5 2 7 3
6 2
4 2 8 9
9 8 2 5 3
1 2 7
5 1
9 6 1
1 5 8
9 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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