Printable Hard Sudoku

Set k7k6a6. 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 4 6
9
7 6 5 3 2
3 2 1 8
5 2 9
1 8 7 5
6 2 5 7 8
7 3 4 1
Hard #2
3 2 9
3
2 8 6
3 5 8
5 1 9 6 4
4 5 3 1
7 3 6 4 2
9
1 5 7 2
Hard #3
1 3 5 9
6 1 4 3
7 3 1
3 7 2
5 6 4 2
8 6 9
2 7
7 4 9 3
1 8
Hard #4
9 7 1
7 5 6 1
8 3
2 3 5
7 3 4 9 1
6 4 7
9 2 5
2 1 3
3 1 4
Hard #5
3 6
8 6 5 9 2
5 7 2
1 5 6 8
6 1 5
2 7 1
6 3
8 5 1 9
6 1 4
Hard #6
6 4 9 7
9 8 7 5 6
5 7
1 4 6
6 9 1 5
7 8 2
8 5 3
1 2 4
4 1
Hard #7
7 6
4 1 3
2 3 1 5
5 6 1 3
5 9 4 7
4 9 2
1 2 6 8 9
5
9 1 6
Hard #8
6
8 1 6 3 9
6 9 7 5
4 1
3 9 2 6
7 2 1 4
8 3 4
5 9 2
2 8 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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