Printable Hard Sudoku

Set 4hf8a. 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 1 3
4 9 8
6 1 9
7 9 8
9 8 4 7
8 3 9 6 1
3 6 2
4 3
8 9
Hard #2
3 2 6
4 6 3
8 3 7
6 1 2
1 4 2 6 8
9 8
8 4 5
7 9 4 2
2 7 3
Hard #3
7 5 9
4
5 9 4 2
4 2 3 7
6 1 5 8
5 9
1 7 6
9 6 5 1
4 6 7 8
Hard #4
4 5 3
8 9 7 1 6
9 1
3 4 6 8
2 6
8 7 9
5 7 6
8 6 3 2
9 8 7
Hard #5
9 4 7
4 2 6
8 1 2 4
9 8 7
6 4 5
9 3 8
5 2 3 9
3 4
1 4 3 2
Hard #6
6 1
1 2 9
7 2
5 8 4 2
3 8 5 6
6 2 3 1
4 7
9
1 9 7 6 3 2 4
Hard #7
9 5 6 4
2 5 1
7 8 4 3
3 6 8
1
6 4 5 7 2
9 2 1 7
2 7 8
8 6
Hard #8
9 8 1
1 9 5 4 7
5 4
3 9 1
6 4 9 5
7 2 1
8 5 6 7
2
3 2 9 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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