Printable Hard Sudoku

Set 1lz7n4f. 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
8
8 4 5 7 3
5 2 1 4
9 1 4
6 1 3 2
4 8 5 3
1 2 5 7
4 9
8 3
Hard #2
4 1 6 8 3
2 8 4 6
3 2 4 5 7
5 9 2
7 6 8
5 1 3
9 7 4 1
9 5
Hard #3
3 6
6 2 4 9 8
9 6 7
1 8 6
9 5 6 3
7 9 8 2 5
9 2 3
4 1
4 5
Hard #4
4 6 2
3 6 9
3 7 5 1
6 2 9 4
3 4 6
8 5 1
2 9 8 3
7 3
6 7 5
Hard #5
4 1 8 7
4 3
2 7 8 3
5 7 9
7 4 3
8 9 2
5 7 3
6 4 3 1
4 2 6
Hard #6
9 3 1
4 9 8 7
5 8 2 9
8 9
8 6 1 5
2 3 6
1 7
5 2 9 1
4 8 5
Hard #7
1 2 6 8 5
2 6 1
4 2
9 5 8 1
1 3 7 4
8 3 7
7 6 8
3 1 5
4 7
Hard #8
3 9 7 5 8 1
5 2 7
4 1 6 3
5 6
3 4
7 8 9
1 2 7
7 4
9 6 3 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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