Printable Hard Sudoku

Set 56cpin. 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
7 6 9
5 3
3 1
2 7
8 9 7 1
9 5 1 4
5 3 7
2 6 9 8
7 4 9 8 5
Hard #2
9 6 5
2 6
6 4 9 1
7 2 3 1
3 4 7 8
1 5 6
3 7 9 4
9 5 7
1 8
Hard #3
2
8 9 7
9 6 4 2 7
8 7 3 2
3 7 5 6
1 5 8
5 6
4
7 2 6 4 8 9
Hard #4
1 9 6 8
6 7 3 5 9
4 3 1
8 7 9
1 8 7 6
2 4 1
6 1
8 2 9 3 4
Hard #5
9 3 1 2
3 1 5
1 8 9
3 1 6 8 4
3 7 9 1 5
4 6 3
1 2 9
9 3
8
Hard #6
6 4 2 5
7 3 9
8 3
2 5 7 4 3
3 9
9 7 8 1 2
3 9 4
2 8
2 8 6
Hard #7
3 2 5
5 7 6 3
8 9 7
2 9 1
9 3 4 7
8 4
6 4 9
8 2 5
4 3 1 8
Hard #8
5 8
5 6 7 9 2 4
2
7 3 1 4
2 1 4
6 8 7 3
9 1 5
6 7 9
9 8 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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