Printable Hard Sudoku

Set nv971y. 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
5 2 7
5 7 9
6 9 3
2 3 4
9
1 8 2
7 3 5 1
3 4 9 6 8
1 2 9 3
Hard #2
9 8 1
7 1 9
5 3 4
5 7
1 2 6 5
8 2 4
5 9
2 7 5 3
4 1 2 5 8
Hard #3
9 1
2 8 9 5 7
7 4 2
7 8
1
5 2 4 1 6 3
2 8 9 1
1 5 3 4
4 6
Hard #4
6 3 7 4
9 1 7
1 2
6 7
3 5 8 4 6
4 2 1
6 3 5
5 3 6 9 7
2 1
Hard #5
9 8 7
8 2 4 1 6
5 1 9
2 6 8 5
5 7 3 4
9 6
3 1 4 2
4
7 1 3
Hard #6
3 4 5
5 6 1
9 7 2
5 8
9 4 2
6 7 2 4
6 4 3 2 1 8
3 9 2 7
8
Hard #7
1 8 4
8 9
9 6 7 5
6 2
4 7 3 6
5 8
8 2 5 7 4
9 4 7
7 6 2 3
Hard #8
2 3
6 4 8
3 2 6
2 8 9 6 1
6 1 9
7 4 6 2
1 5 6
3 7 6
3 8 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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