Printable Hard Sudoku

Set 1en02kf. 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
2 8 6 9
2
5 4 8 2 7 1
8 6 1 4
3 8
3 2 7
3
8 5 1
9 3 4 5 8
Hard #2
3 1 7 8 5 2
7
7 9 5 6 3
6 7
2 1
5 3 4 9
5 1
7 4 6
8 2 3 5
Hard #3
6 4 3
8 2 5
9 2 1 4
8 7 1 2
1 9 8 6 7
5 6 1 7
7 1 8 4
2 3
Hard #4
8 4 2
3 5 8 4
7 9 3
5
6 5 1 4 9 2 8
7 2 1 4
5 6
1 6 7
8 9
Hard #5
9 1
1 6 4 2
9 6 8
1 2 9 6 5
5 3 8
9 5 3
4
2 6 7 3 5 9
5 7
Hard #6
8 7 5 4
4 3
5 7
3 6 4 1 9
9 7 4 8
2 6
8 5 7 3 1
1 6
2 9 5
Hard #7
3 4 7 2 5
6 3 4
1 3 8
8 6 3 9 2
8
4 1 7
2 4
8 5 7 9
4 1 9
Hard #8
9 7 1 5 8
4 1 5 7
8 4
6 9 3
6 4 8
2 8 3 9 7
6 9
5 9 2
4 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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