Printable Hard Sudoku

Set 1ha8zm7. 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 6 5 8
6 3 2
4 5 9 1 8
4 6 3
2 6
2 8
8 9 2 5
6 4 1 7
2 4
Hard #2
9 3 1 8 6
5 9
4 6 2
4 6 9
7 3 8
8 6 5 1
4 1 9 7 2 8 5
8 9
Hard #3
7 2 4 6
3
2 3 7 1
4 7 5 9
1 4 2 5
8 7
3 5 4
5 7
2 4 9 6 7
Hard #4
1 9 2 3
7 2 5 6
5 8
6 1 9
7 4 3
2 9
3 7
6 8 4 5
5 3 9 1 8
Hard #5
2 9 5 1
7 3 1 4
6 5 3 9
8 7
1 6 3 9
4 6
9 2 1
5 6
4 6 5 3
Hard #6
6 3 2 5
3 2 4 1 9 8
6
3 5 2 7
6 8 3
4 6
1 2 5
8 2 4 1
4 9
Hard #7
4 7 2
3 6 7 4
8 3
9 6 4 8 1
3
1 8 5
7 1 8
2 9 3
9 1 2 7 6
Hard #8
8 3 9
6 8 7
1 5 9 4
1 7 5 2
8 1 9
8
7 1 4 6
4 2 3 1 9
5 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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