Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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