Printable Hard Sudoku

Set ntwv7f. 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
3 8 5
1 2 3 4
4 9 7
8 4
4 5 3 2 6
3 9 5 4
2 5 8 1
6
2 5 7
Hard #2
2 8
9 1 7
7 3 9 2
5 3 6 2
6 4 5 8
8 6 7
9 3
1 4 9
8 5 1 4
Hard #3
6 1 3 8
7 5
5 4 3 9 1
8 4 6
6
4 7 5
2 9 5 1
8 7 6
7 1 3 4
Hard #4
3 1
9 1 2 6 8
6 4 9
8 6
5 6 4
4 2 5
7
2 9 1 6 3 4
3 6 8 2
Hard #5
6 9 5 1
7 4 8
7 8
5
8 1 4 3 5 6
4 3
3 8 5 2 4
5 6 3
8 7 9
Hard #6
7 4 9 2 3 6
2 3 1
9 3 7 1
4 2 7 8
8 6 9 4
1 7
9 7 1
7 3
6
Hard #7
3 1 4 6
7 4 9
9 5 1 3
6 8
6 5 3
9 4 2 3
5 1 4
9 3
8 7 6 3
Hard #8
4 2 8
6 3 9 7
6 2 1
1 4 6 2
7 6 4
3 5 8
6 1
5 2 3 9
1 9 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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