Printable Hard Sudoku

Set na994b. 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
6 3
4 9 1 8
7 2 3 1 5
5 9
5 7 2 3
1 6 9 4
3 8 5
1 6 7 8
2
Hard #2
3 8 4
9 8 7 5
6 7 2
3 5 8 1 9 2
7 1 8
9 2
7 2
4 8 3 5
6 4
Hard #3
8 4
5 7 8 1
1 9 6 4
1 6 7 2
4 1 9 2
3 5 8
4 5 6
8 1 3
3 2
Hard #4
5 3 4 8
9 8 2 5 7
8 4
3 4
2 9 6
3 5
1 9 4
7 9 4 5
8 6 3 1
Hard #5
4 6 1
7 4
9 2 7 5
7 5
3 9 8 5
6 1 2 3 8
4 8 7 6
3 7 6 9 4
Hard #6
8 4 5 3
2 6
3 4 6 9 8
3 2 1 8
7 8
1 3 5 9
8 6 2 4
5 2
6 9
Hard #7
8 3
2 7 6 9 1
1 4 7
8 4 7
3 6
9 7 5 4 1
1 5 9 4
6 2 5
8 6
Hard #8
3 4
5 3 6 7
9
8 2
2 9 8 7
7 8 5 3 4
3 8 7 1
4 9 3
1 6 4 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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