Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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