Printable Hard Sudoku

Set lbhfz6. 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
7 9 2
5 9 3 1
6 2 1
9 1 5 3
8 7 3 5
4 9
3 7 5 6
6 3
1 8 9
Hard #2
4 5 6 2 8
5
3 4 1 9
9 2 8 1
8 1 6
7 3
4 6 5 2 7
3 9 8
4 3
Hard #3
2 7 9
6 3 5 1
1 3 4
8 6 2
5 1 8
8 9 1
3
1 6 3 2
9 8 6 1 4
Hard #4
1 8 2 7 5
5 7 1 2
4 3 1
6 5 9
5 6 4 7
6 8 1 9
9 1 8 2 3
6
Hard #5
9 5 8
6 3 7
8 2 4
9 8 5 2 6
6 4 1 9
7 3 1
7 5 8
6 9 4
1 6
Hard #6
4 2 5
6 9 5 7
1 8 2
1 6 5 7 2 8
2 1 9
2 1
6 7
3 4 5
8 1 6
Hard #7
8 3 7 5
1 8 3 4
5 9 2 8
5
3 1
7 5 1 8
7 2 9
6 3 2 7
5 9 1
Hard #8
1 7 5 4 9
4 1 8
2 8 7 6 1
1 3 7
5 9
9 8
1 6
3 1 9 8 5
7 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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