Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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