Printable Hard Sudoku

Set 1lia4vc. 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
3 8 6
6 4 7
2 5
6 4
5 8 4 9
9 2 5 6 1
9 1 3
9 1 7 4
2 8 1
Hard #2
3 4 8 2 1
9
8 4 2 7 6
3 2
5 6 2 9
7 5 8
5 7 4
2 5 1
4 6 8
Hard #3
3 6 5 7
4 9 8
1 5 8
6 8 1
1 9 2
2 9
9 8 3
7 2 6 9
1 5 8 2
Hard #4
6 2 4 5 1 3 7
6
5 9 8
7 3 8 4
2 6 7 1
9
7 3 8 4 2
4 5
7 1
Hard #5
4
9 5 3 2
1 7 5
5 8 4 6
5 8
2 4 5 9
7 2
8 6 9 5 7 3 1
9 5
Hard #6
7 6 8
2 1
6 3 9 7 1 4
8 3 2
2 3 7
4 8 1
7 8 1
1 6
1 5 9 6
Hard #7
1 2 5 8 7
7 4 8
8 4 5 1 3
4 7 9
9 6 2
6 8 3
2 6 7
8 3 4
3
Hard #8
5 2 7 4
3 1
8 4 6
6 9 1 4
2 6 8
5 2 6
3 9
9 7 1 2 6 8
5 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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