Printable Hard Sudoku

Set 9lvki4. 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 5 2 1 4
8 9
1 2
1 9
5 7 1
9 8 2 7
1 6 8 5
9 2 7
7 9 6 3
Hard #2
3 8
5 1 2 7 4
9 1
4 9 8
7 8
5 4 3
3 6 7 1 9
1 4 8
2 8 5 6
Hard #3
9 5 4 3
1 7
7 4 3 8 6
9 4 1 2 5
1 9
1 3 7
3 8 5
6 9
1 5 4
Hard #4
8 1 3
4 6
7 4 6 2
9 8
5 3 7 2
8 9 3 7 5
2 8 5
1 4 3 6 7
6
Hard #5
8 2 6 3 5
5 8
2 3 9 5 8 4
7 4
6 1
1 6 5 2
2 1 7 8
7 4
3 9
Hard #6
2 1
9 6
9 3 7 2
3 5 8 4
7 5 3 8
8 4 3
9 5 3
3 1 8 7
6 8 1
Hard #7
4 8 2 6
6 9 8
5 4
2 6 3 1
1 8 4 5
1 3 7
6 9
8 2 6 1
5 6 3
Hard #8
3 7 2
7 2 5 8
1 4 7
1 7 4 3
2 5 6 8 1
8
3 9 6
7 2 8 1 3
7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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