Printable Hard Sudoku

Set 6f6ofc. 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
4 8 9
8 3 7
7 5 4 1
9 2 7 4
5 7
1 4 9 8 7
5 3 2 9
8 1
2 7
Hard #2
3 7
2 4 5 7 6
3 4 9 1
6 1 2
8 1 2
7 8 4
2 6
4 7 5 9
9 4 8
Hard #3
4 5 1 3
1 3 2 6 5
1 8
9 2 5 3
1 9 2
6 5 1 8
1 5
6 7 1 4
3
Hard #4
8 7 3 9 4
1 4 6
6 1 9
4 7 9
5 7
9 2 1 8 5
9 3
2 9 6
4 5 8
Hard #5
5 4 3 6
1 2 9
7 9 5
3 4 5
2 4 1 5 6
2
1 3 6
4 9 8 7
6 7 8
Hard #6
9 5 2 3
7
6 3 8
4 2 6 8 1
1 2 9 6
5 7 4
2 9 4 5 8
8 2
1 2
Hard #7
6 7 3
4 1 5
2 9 8
3 2 7
2 8 9
3 4 2 8
5 6 1
4 3 1 8 9
8 7
Hard #8
5 8 4 3
3 5 6
4 6 9 1
7 6 1
9 4 5 3
4 9
7 3 2 4
5 3
2 6 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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