Printable Hard Sudoku

Set a1cih8. 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
7 3
1 9 8
3 5 4
6 5
5 8 1
3 9 6 7 8
3 9 7 5 2
2 4 7 3
6 2
Hard #2
6 7 3 5
4 1 9
3 5 7 6
9 2 4
8 6
2 5 1 3
9 2
3 8 5
6 1 7 8
Hard #3
1 6 3
2 8
8 2 4 3
7 6 1 9 4
1 7 8
9 4
5 8 3 1 4 9
4 5 3 2
Hard #4
3 1 4 5 8
5 6 1 3
8 1 6
8 1 3 5
5 7
7 4
9 4 5 7
6 8 7
8 3
Hard #5
5 2 7 9 3
7 9 4
5 6 8
4 7
8 2 5
1 9 2
2 5 8
4 9 1 3
5 8 4
Hard #6
6 2 5 4 8
8 4 5 9
9 8 7
6 4 1
8 5
3 4
3 7 1
2 8 9
7 6 5 3
Hard #7
8 2 3 4 1
7 5 9 3
1 6 7 2
9 4
2 3 1 8 6
6 9
1 5 4 2
4 6 5
Hard #8
9 6
6 4 7
1 2 5
5 1 2 9
2 5 3 7 4
4 1
7 1 6
4 9
6 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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