Printable Hard Sudoku

Set juqc6a. 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 7 3
8 3 9
2 4 5 8
8 1 4 9
9
4 7 1 3 8
6 4
5 7 8
8 1 2 7
Hard #2
8 2 5
7 1 9
9 4 2 8 7
6 7
8
2 4 9 3 6
3 1 9 5
8 2 5
4 3 6
Hard #3
7 8 1 5
4 2 3
6 4
5 6 2 4
9 5 7 3 8
3 8 9
6 1
8 3 1
6 7 8
Hard #4
3 5 7
1 8
3 9 8 7 5
8 6 3 9
5 9 4
9 3 6 1
3 4
6 1
3 2 5 6
Hard #5
1 9 2 3
4 1 7 6
6 8 3
7 5
4 3 6
9 7 1
4 9 7
2 5 4 9
8 1 2
Hard #6
1 8 5 7 4
3 5
6 8 1
1 5 6 2
9 6 7
2 1 3
8 2 6 1
7 4 8
4 8
Hard #7
5 2 3
2 9 5 6
3
8 5 2 9
9 5 8 6
4 1 5 8
1 8 2 3
7 8 9
7 4
Hard #8
3 9 6
5 4 2 9
8 1 9 5 7
2 8 1 7
4 3 1 9
9 8
4
4 9 7 3
5 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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