Printable Hard Sudoku

Set f6dh4i. 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 5
6 5 3
6 7 9 4
8 5
1 8 6 2 5
2 7 1
7 9 4 2
8 2 9 7 3
2
Hard #2
3 1
4 6 2 5
6 9 2 4
3 2 8
5 7
5 7 8 1
3 6 8 1
7 2 6
9 5 4
Hard #3
7 4
6 8 9 4 1
9 5 3 7
2 6
6 5
1 4
5 9 2 3
8 3 4 9
3 8 1 7
Hard #4
1 2
7 1 3 9
3 4 6 1
4 9 6
1 9 7 3
8 2 5
5 7 4
7 6 5 2 9
5
Hard #5
7 3 4
6 9 5
1 3 8 7
9 6
4 1
3 9 2 7
7 5 9 8 2
3 7 6
8 7 4
Hard #6
6 3 7
6 3 7 4 9
4 8 2
2 4 7 5 1
8 1 6 4
3
8 4 6 7
9 5
1 8
Hard #7
2 9 3 5
4 6
6 5
9 7 4 2
6 4 9 8
7 3
8 3 6 5 2
2 3 1 7
9 4
Hard #8
5 2 1
3 2 1
4 5 6 3 9
4 9 7 1
5 2
7 8 4
6 9 1 3
8
8 2 3 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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