Printable Hard Sudoku

Set 1axawf8. 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 9
1 6 3 7
8 4
8 1 5 7
2 5 7 8 6
8 5
7 9 8 6
5 3 9
5 7 1
Hard #2
3 7 4
1 9 8
4 3 1 8
2 6 4 5
8 3 7
3 9 2
6 3
8 5 7
5 1 2 8
Hard #3
6 9
5 4 7 8
7 8 1 5
5 7 9 6
3 2 5
4 8 2
7 4 5
2 9 6
5 8 9
Hard #4
3 4 6
5 4
2 4 8 7 3 5 1
8
5 3 1
7 8 6 9 2 3
6 7
9 2 3 1
4
Hard #5
7 3
9 5
8 2
6 1 3 9
6 4 3 1
5 7 8
1 2 4 7 5 8
8
4 3 8 9 6
Hard #6
6 5 2
6 5 1
5 8 4
2 7 9
9 1 4 5
1 5 6
9 4 2
7 6 5 8
3 9 1
Hard #7
4 3
5 6
3 8 4 1 5
6 5 2
1 3 4
9 1 6 7
3 9
5 2 3 8
1 4 5 6
Hard #8
7 4 6
9
6 8 7
3 6 8 9 5
9 6
1 8 9 7
2 4 8
4 7 3 8 2
3 5 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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