Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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