Printable Hard Sudoku

Set nobd9m. 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 4 6 1 7
8 7 1 3
3 1 7 2
1 6 8 9 5
5 9
2
6 4 5 9
3 7
3 6
Hard #2
1 3 2
6 4 5 1
9 6 5 7
8 2
9 2 7 6 5
1
3 4
4 7 3 6
9 1 2 3
Hard #3
7 9 3 1
9 2 6 5
6 8 2
1 7 9
6 2 9 4
4 3 8 1
2 5 7
2 3 7 8
Hard #4
1 7 9 4
8 4 2 5 7 3
3 8 1
5 4
7 8 3 2
6 7 3
3 5 6 8
5
2 7
Hard #5
6 4 2 8
1 9 8 7
2
2 3 5 8 7 1
2 5
4 1 9
6 8 1 5
4 5 9 3
7
Hard #6
9 6 8
9 4 8 2
2 5 3 1
4 6 9
1 7 5
2
9 4 6
1 3 7 4
5 7 3 6
Hard #7
7 6 3
5 2 6
8 5 9
6 2
3 4
1 9
5 3 4 9 8 2
9 3 8 5 7
2 6 5
Hard #8
4 2
8 6 4 5 1
3 2 1
1 4 9
2 4 1 8
9 5 7 8
9 6 3
9 1 2
5 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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