Printable Hard Sudoku

Set gz9clx. 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 8 4
9 1 7
5 3
6 3
2 3 4 8
4 9 2 1 5
8 9 3
7 2 9 5
1 4 7
Hard #2
6 8 5 9 7 3 2
5
1 2
4 5 1 7 8
1 7
8 7 5 3
6 2
3 5 4
9 4 8
Hard #3
9
3 2 7 4
1 5 6 9 7 2
2 4 5
6 8 5
7 1
2 6 7 3
2 7 4
3 7 5
Hard #4
4 1 2 8 7
8 5
2 4 9
5 4 2 9
1 2 7 8
6 1 2 3
6
7 6
3 5 9 4
Hard #5
2 6 1 5 7
8 2 7
1
6 7 2
9 2 1 3
6 4 9
5 1 2 4
4 9 6 2
2 5
Hard #6
2 9 8 3 1
4 8 1 3 2
6 9
7 5 4
7 2
3 2 8 4 6 1 5
8 6
5
4 7
Hard #7
4 8 7 5 1
2
6 9 1 3 4 5
1 3 2
5 4
1 7 8 6
2 8 4
5 6
3 7 5
Hard #8
9 4 7
4 1 5 9
7 2 4
3 9
5 4 2
6 1
2 6 4 1 5
7 8 4
1 3 9 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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