Printable Hard Sudoku

Set gu70zz. 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 3 6
9 5 4
2 8 9
4 2 7
7 1 4
6 9 1
8 7 1 9
4 9 2 5 7
8 4
Hard #2
8 6 7 2
6 1
4 1 9 5
8 9 4 7 3
3 7 8
2 9 8 6
9 3
7 6 1
5 2
Hard #3
8 2 7 5
6 5 9 2
2 7
9 2 8 7
1 4 8 2
3 6 4
5 6
4 7 6
3 9 1
Hard #4
9 1 8
8 1
6 2 5 4 3
5 3 2 1
2 5 8 6
7 2 9
6 8
5 8 7 1
4 2
Hard #5
9 1 8
8 1 2
7 9 8
5 3 9
2 6 7
6 8 9 1
6 3
6 4
9 8 5 1 2 4
Hard #6
6 2
9 7 1
2 5 8 9
2 5
1 6 2 5 9 8
9 6 1
3 2 5
2 7 6
8 4 1
Hard #7
3 7 1 2
8 4 9
7 5 9
2 5 4
4 7 1 3 2
1 5 9
7
3 8 5 1
6 5 3
Hard #8
6 4 2 3 9
7 9
3 2 7
6 9 1 5
9 7
2 8
8 3 6
5 1 8 7
4 1 8 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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