Printable Hard Sudoku

Set zcqz80. 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
3 9 8 7
5
6 1 4 8
6 8 5 3
9 1
4 5 3 2 6
4 2
1 5 9
2 9 3 5
Hard #2
4 8 6 7
9 7 3 8 2
8 4 1
3 9
4 8 3 1
6 5
5 8 3
9 5 6 2
3 5
Hard #3
5 8 1 7
9 3 6
2 8 4
9 6 3
9 3 8
6 8
9 8 1 7
7 6 4 2
9 1 4
Hard #4
8
6 1 9 2 7 3
3 8
1 6 2 5
8 6 4
7 6 1
9 7 4 3 2
2 1
6 1 8
Hard #5
8 7 2 6
6 1 2 4
6 9
4 7 9
8 3 4 5
6 1
5 7 3 6 1
2 5
9 2 4
Hard #6
3 8 1 2
3
6 2 7 9 4
5 3 9 1 8
7 9 2 6 8 5
4
8
3 9
4 2 1 8
Hard #7
1 2 8 3 9
4 9
5 8
1 9 5 4
8 5 3 7
3 2 9
5 7 2
9 4 6
8 6 1
Hard #8
9 3 8 1
1 9 3
2 5 9
4 9 8 2
8 4 5
5 6
1 6
9 3 7 1
3 7 1 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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