Printable Hard Sudoku

Set z9hrxc. 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
2 9 3
1 7
4 9 1
5 9 2 3 4 8
6 1
8 6 9
9 7 5
5 2
8 3 2 6 1
Hard #2
9 6
2 9
6 4 1 9 7 8
9 7 6
7 5 3 1
5 6
3 1 2 4 5 7
3 8
9 5
Hard #3
4 8 5 1
1 9
2 5 8 9 4 7
2 1
4 3
7 3 6
4 5 7
6 7
4 1 8 9 5
Hard #4
9 2
1 7
4 2 8 9 1
6 4 2 3
4 5
9 5 7 4 2 1
3 6 9 4
1 4 8 6
Hard #5
8 5 2
6 3 4 1
1 7 5 3
5 8
7 3 1 5
6
5 1 7 8
6 8 2 3
1 4 9
Hard #6
5
2 9 6 4
6 4 5 1 8
2 7 9 1
4 5 2
7 9 3
5 3 6
3 1 2 8
4 2
Hard #7
1 5 6 8
6 8 2 3 5
8 9 5
2 4 1
1 5
7 6 1
9 2
8 3 5 9
7 5 4
Hard #8
1 4 9
6 7 4
5 7 3 8
4 9
1 6
6 5 2 9 7
4 2 9
8
5 4 2 8 6 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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