Printable Hard Sudoku

Set 1h6soim. 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 1 9
7 6
5 6 3 4
5 8 7
6
2 7 1 8 3
3 1
4 5 1
8 6 7 9 3
Hard #2
6
3 4 7 9
5 4 1 3 8
3 1
6 1 8 4 9
4 5 7
7 3 9
3 7 8 2
6 5
Hard #3
9 2 7
7 3
9 5 4 3
8
2 3 6 9 1
9 3 7 5
5 6 8 2 7
4 8 3
9 6
Hard #4
5 1 3 4
7 9 5
2 6 8 4 7 9
8 3
3 4 6
4 2 5 8
3
7 6 8 1
8 5
Hard #5
7 8 4 3
1 2
9 2 8
2 7 8
3 8 1 4 9
9 4 5 1
1
1 9 7 4
8 5 1
Hard #6
4 5 1 3
3
3 7 8 5
4 2
2 3 1 7
2 5 1 8
4 8 7 9
8 6 2
6 2 3
Hard #7
8 1 3
6
7 9 1
4 6 1
9 5 3 2 4
3 5 9
1 3
9 6 3 2 5
4 1 9 6
Hard #8
5 4 6
3 6 8
1 2 3
3 6 2
1 8 4 5 6
8 1
9 1
4 1 7 2
9 8 5 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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