Printable Hard Sudoku

Set 6d6l1h. 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 2
5 4 1 3
1 6 4 7
6 2 5
3 7 8 9 5
1
7 4 6 1 9
9 5 7 6
2
Hard #2
8 2
1 7 3
2 5 4
3 7 1
4 7 3 1 5
6 4
3 5 4
9 2 3 6
5 6 4 8
Hard #3
8 9 5 2
9 5 4
4 2 1 8 6
9 2 4 6 1
3 6
8 1
6 5 8 9 4
3
1 2
Hard #4
6 2 3
2 6 9 1
7 5 2
4 7 8
5 8 6 2 4
5 1
5 4 1 8
2 7 9
1 3
Hard #5
9 7 8 1 2
5 2 6 1
1 8 4
2 5 1
3 7 2
1 9 3 7
2 8 3
8
6 1 8
Hard #6
4 1 2 8
7 6 2 3
1 7 6
6 3 9 1 2
9 3
4 6
4 5 8
5
3 6 8 7 5
Hard #7
4 6 8 1 7
3 9
5 3
3 2
6 4 2 1 5
8 9 7 1
7 6 1
3 8 5
7 4 6
Hard #8
8 5 4 3
8
7 2 5
1 3 8
7 6 2 1
1 9 3 2
1 4 6 2 9
2 3 1
5 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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