Printable Hard Sudoku

Set 31885k. 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 5 2 1
6 8 3
3
2 4 9
9 2 5 3
6 3 5 4 7
3 5
9 2 5 6 7
7 6
Hard #2
5 8
3 8 1
5 1 3 7
3 2 5
9 1 8
4 2 3
4 7
5 3 2 7 4 1
7 4 6
Hard #3
4 3 9 6
5 9 1
9 7 3
3 6 7
2 5 4
5 9 7 4 2
6 8 1 4 7
6
7 8
Hard #4
7 1 8 2
3 6 5 8
8 2 4
3 4 5 9
5 7 8
6 1
3 9 1 6
1 6
2 8 5
Hard #5
6 4 5
2 1
9 3 5
4 2 1 7 3
9 4
8 3 2
3 9 8 5
1 9 3 2
2 7 6
Hard #6
5 8 6
8 7 1 4
6 1 3 8
7 1 5
4 5 6 3 7
3 2
8 9
6 3
1 5 3 9
Hard #7
9
4 2 5 3
3 5 8 6
9 2 3
3 6 4 7
8 7 1
5 2 8
6 7 2 1 3
6 8
Hard #8
2 9
3 2 8 4 5
7 8 3 9
1 5 9 4
2
9 3 6
3 8
2 5 3 7
1 8 7 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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