Printable Hard Sudoku

Set 8yx7im. 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 5 2
1 2 5 6 7
7 8 3 1 6
9
9 2 1
4 8 5
5 6 2 9
9 4 7
6 9
Hard #2
5 4
1 6 2 9
4 9 2 1
9 3 4
4 3 9 2 5
7 6
5 3
8 7 6 5
2 6 9
Hard #3
8 4
1 2 7 5
3 4 8
6 3 7
5 6 2 1 3
7 1 6 8
1 9 4 8
3 5 6 2
Hard #4
5 3
2 7 1 9
8 7
9 4 2
3 8 9
4 7
5 7 8 1 4
4 2 6
8 3 5 2 1
Hard #5
5 1 9
8
4 2 9 6 7
5 4
8 5 6 9 2 3
2 1 6
4 9 2 8
5
2 1 4 3
Hard #6
8 6 2
2 5 7
2 4 8 5
3 9
7 9 1 3 4
5 9 6
2 3 4
3 7
9 7 6 5
Hard #7
7 6 9
5 3
3 1
2 7
8 9 7 1
9 5 1 4
5 3 7
2 6 9 8
7 4 9 8 5
Hard #8
9 6 5
2 6
6 4 9 1
7 2 3 1
3 4 7 8
1 5 6
3 7 9 4
9 5 7
1 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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