Printable Hard Sudoku

Set f0xonm. 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 5 7
5 8 4
9 6 1
3 8 7 9
9 2
7 6 1 9 8
1 2 4
8 6 1 2
9 1
Hard #2
6
4 9 5 1
3 1 5
3 9 5
8 1 4 7
9
3 6 7
1 2 4 7 8 5
6 8 9 1
Hard #3
5 1 4
6 5 3
7 8 6
6 1 9 7 8
4 6 7
2 4
4 2 5
9 5 4
2 7 9 8
Hard #4
9 7 4
6 8 9
6 1 2
4 5 3 7 8
7 8 2
5 6 9
3 2 6
3 6 4 7
2 1
Hard #5
9 3 6
2 5 1
4 5 8 1 2
7 2
3 2 8 9 4
7 6 3
8 4 7
5 1
9 1 3
Hard #6
2 3 7 1
9 3
4 5
9 7
4 1 2
1 6 5 2
9 7 2 6
7 4 3
3 5 7 4 2
Hard #7
9 6
4 7 3 8
1 4
9 7
7 4 2 1 8
1 6 7
6 3
8 6 9 1
5 4 8 9 7
Hard #8
3 1 4 6
9 5 6 7
1 2 8 9
4 9 1 5
5 2
5 2 9 7
7
6 4 2
1 9 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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