Printable Hard Sudoku

Set m6hzz8. 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 9
6 8 4 5 2
2 8
3 9 5 6 7
1 5
3 7 6 4
1 3 9 4 8
1
7 3 5
Hard #2
2 4 7 6
7 8
6 9 5
3 7 2
9 1 5 2
5 6 4
9 7 6 2 5
1 6 7
8 4
Hard #3
6 7 4 5 3 1
8 9
8 3 5
7 1 5 3 6
3
2 7 8
3 9 6 1 8
2 6 1 4
Hard #4
4 5
3 4 8 9 2
5 7 6
9 5 4
1 9 2
4 7 8 9 6
4 7
1 3 4
8 9 1
Hard #5
4 1 5
5 6 2 9
3 8 2
8 7
5 3 4
7 1 5
9 4 7
5 4 3 9 8
2 8 5
Hard #6
6 4 1 5
8 9 6
1 7 4 8
8 5 9
5 2 7 1
2 9 3
9 7 6
5 3 8
7 3
Hard #7
2 6 5 9
2 9 4 3
4 1 5
3 4 8 7 2 1
6 8 1
7 3 1 8
2 5 9 7
2
Hard #8
1 3 2 5
8 4
1 8 3 6
5 2 8
7 5 4
1 6 9
7 2 5 6
8 4 1 7
1 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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