Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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