Printable Hard Sudoku

Set 1khn5nw. 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 6 1
3 8
4 3 1 2 7
9 8 2 6
1 3 5 8
3 4 2
2 4 5 3 8
1
Hard #2
9 3 4 8
6 5 2 1
7 9
5
5 2 9 3 4
1 6
8 6 1 5 9
2 5 7
9 6 4
Hard #3
6 1 2
5 9 4
3 8
3 1 8 9
7 2 9 5 6 3
2 1
8 4 7 9
3 5
7 4 8
Hard #4
9 8 4 3
9 8
7 1 3 2
4 7 1 3
5 2 6 8
2
6 7 2 8
5 7 4
4 9 1
Hard #5
5 9 8 6
1 3
4 5
6 5 7 1
2 4 8 9 7 6
9 1 5 3
9 3 2
6 1
3 4
Hard #6
4 2 7
2 8
1 6 5 9
3 6
6 2 5
9 4 8 3
5 4 7 1 9 3
8 9 3
5 6
Hard #7
8 5 6 4
2 3 9 1
4 9
9 5 3 6 8
5 2
6 8
8 2 3
8 9 3 4
5 6 7
Hard #8
6 8 1 3
8 5
9 8 1
6 9 4 1
4 3
4 7 5 6 8
4 1 3 9
1 7 2
7 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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