Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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