Printable Hard Sudoku

Set vb2ocx. 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 6 9 5 7
5
8 1
8 5 3
5 4 7 1
3 4 2 7 6 8
4
4 6 2
6 1 3 8
Hard #2
7 4 5 8 9
4 6 2
2 3 1
1
6 1 7 9 4 2
3 8 5
4 2 7
5 6
7 1 5
Hard #3
8 7
1 2 7 6
7 5 4 8
9 7
2 5
6 7 1 8 9
2 4 5
4 8 1 3
9 6 1
Hard #4
1 3
5 6
5 9 1 3
4 1 3 2
2 1
2 7 4 9
9 8 7
3 5 8
5 4 7 2 6
Hard #5
4
1 8 6 7 3
2 1 8 6
4 2 1
9 6 5 2 8
8
5 9 7 1
5 3
1 6 4 7
Hard #6
1 4 8 6
2 7 3 9
4 2 5
9 3 6
8 6 7
1 7
5 4
7 9 8
9 1 6 4 3
Hard #7
6 5
2 3 4 9
6 3 9
2 8 6 3 1
6 7 2
1 6 9
9 8
9 1 6 3
4 5 1
Hard #8
6 4 3 9
3 8 5 7
7
2 3
8 3 5 1
4 7 9 5
2 7 8 3 9
5 8 3 1
1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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