Printable Hard Sudoku

Set km0zqk. 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
8 5 6
5 9 6 4 3 1
4 5 8 9
6 1 4 9 8 3
2 7
8 9 7
2 6
7 5
Hard #2
3 1 2 4
4 6 8 2
8 7 3 1
6 4 2 7
9 7 5
8 6 4
6 9
3 8 1 7
5
Hard #3
3 2 7
5 4 3 8
9 8
7 2 6 4
1 9 6
2 5 4
9 4 3
8 1 7
1 5 6 4
Hard #4
5 3 8
6 4
2 1 7
7
4 1 9 5
9 5 3 7 6 1
8 6
2 3 9
1 4 5 2 6
Hard #5
3 7 5 6 1
1 8 4
2 8
7 1 9
9 3 6 7 8 5
6 2 9
4 9
5 6 2
8 6
Hard #6
2 4 5 8
6 7 3
5 1 6 7
7 3 2
3 4
7 5 8
1 9 5
1 4
4 2 6 7 1
Hard #7
5 4
3 4 7
4 9 8 5 6
3 6 1
5 8 1 4
9 5
6 7
6 3 9 2 5
1 2 9
Hard #8
9 7 5 3
7 1 8 2
3 8 9
7 3 1
4 5 9
3 4 6
9 3 8
6 1 9
2 7 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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