Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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