Printable Hard Sudoku

Set zm4fyh. 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
5 6 8 9
4 7 9
1
6 7
8 2 4 7 5 3
3 9
9 1 3
1 5 3 6 9 8
8 1
Hard #2
5 8 9
4 8
7 6 9 3
9 3 6 1
2 6
1 9 3
9 3 8 4
7 6 1 9
4 5 6
Hard #3
5 8 6 9 3
6 9
7 5
9 3 1 8 2
6 9 1 8
4 3 5
3 2 5
1 8 9
4 5
Hard #4
6 4
5 8
4 3 2
7 8 5 4 9 6 1
3 5
6 5 7
5 6 7
3 1 9
2 1 8 3
Hard #5
2 8 9
8 6 1
6 5 9 4
7 5 2
9 4 7 8
8 6 1
7 1 4 2
3 5 1
2 3
Hard #6
5
1 7 6
8 4 5 2
3 6
5 2 7 4
8 1
3 9 6 1
1 5 2 3
6 3 8 7 4
Hard #7
8 1 5 9
5 9 2 8
7 4 2
5 4 8 7
9 4 8 1
7 6
6 9 3
2 3 9
1 4
Hard #8
2 5
6 7
8 5 4 1 2 6
6 9 8
7 2 3 9
4 6 5 1
9 1 2
5
8 9 7 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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