Printable Hard Sudoku

Set ss9tnb. 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
1 2 8 3 4
3
8 7
7 1 8 9
8 5 7 6 1 2
4
5 9
3 1 2 8
2 9 4 3
Hard #2
7 5 6 4
6 7 1 8 3
8 6 9
4 3
9 5 8 4 2
8 9 4 1 3
2 8
4 8 9
Hard #3
9 7 1 4
2 7 4
1 8 6
8 4 3
7 1 2
6 7 8
9 3
5 6 7 9
3 1 5 8
Hard #4
4 9 3
1 9 8 4
5 6
6 4 2
7 3 6 5 1
3 6
9 1 2 6 3
9 7 1 8
9
Hard #5
9 6
2 1 7
3 1 2 4 8 5
7 6
4 2 9 8
9 1 4 5
3 8 7 1 9
1 3 6
Hard #6
5 1 3
6 3 7 4 8
6
2 3 1 6
8 4
7 6 8 5
4 2 3 9
7 2 4
5 8 1
Hard #7
9 6 7
1 6 4 3
3 7 9
4 1
7 2 5
1 5 2 4
1 4
7 4 8
6 5 1 4 8
Hard #8
3 2
9 8 7 6
2 8 6
4 2 7 3
6 1
1 5 3 8
4 5
2 9 8 4 3
6 5 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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