Printable Hard Sudoku

Set 92tsrb. 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 3
3 2
3 8 2 5
3 2 9 4 8
4 1 5
9 7 3
6 9 7
1 2 6
8 5 3 4
Hard #2
3 5 4 1 6
4 1 6 9
5 6 7 2
5 4 3
4 9
3 9 2 8 1
3 2
7 1 6 5
Hard #3
9 5
8 3 1 7
6 9 4 1
9 4 6
1 6 9
8 2
9 5 1 7 8
6 7 5 4
4 2
Hard #4
2 6 4 8 9
5
9 3 2
1 8 4 9 7
9 2 1 7 3
4 1
9 7 3 1
4
8 7 2
Hard #5
9
5 4 3 7
1 4 6
5 4 9 2
6 4
2 1 4 5 9
7 2 1 4 3
4 6 5
5 8
Hard #6
7 6 8 2
8
1 4 9 5
2 9 1
1 6 3 4
5 4 6 7
3 1 4
8 2 5
9 1 4
Hard #7
5 3 2
7 4 6 3 1
3 8 1 4
9
5 6 8 9
1 3 5
2 3
5 3 1
6 1 4 5
Hard #8
3 5 1 7 8
8 9 2
4 6 3
5
3 4 2 6
2 9 1 6
8 2 5
7 3 5
4 2 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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