Printable Hard Sudoku

Set cv4h3o. 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
6 4 9
7 3 5 1
8 2 5
2 8 5
4 6 9 7
1 5 2 8
5 3 7
3 9
6 1 4
Hard #2
6
3 4 9
9 7 4 3 5 1
6 4
4 8 9 5
6 2 9 7
2 9 7 5
7 9 5 3 8
Hard #3
3 4 1
9 5 6 7 3
1 7
6 5 8
2 3 4
7 3 5
3 5 2
7 9
9 2 1 6 8
Hard #4
8 6 9 4 1
4 5
9 6
7 3 6
3 8 2 6 5
6 5 8
7 9 8
3
4 3 7 6 9
Hard #5
6 3 1 7
7 4 5
6 5 2
8 2 7 9
9 8 3
2 3 8
9 3
1 3 2
3 4 7 6
Hard #6
5 8 9 4 3
4
7 2 3
7 9 1 6
1 5 7
2 4 3
3 8 6
5 7
4 8 5 2 1
Hard #7
7 3 5 4
6 5 9 1
4 3 7
6 5 2
5 1
2 1 5 7
4 8
9 2 7 4
1 3 2
Hard #8
6 5 4
1 9 7
2 1 6 8 9
4 5
8 5 7 1
7 9 5 3 2
9 6 3 5 7
3 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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