Printable Hard Sudoku

Set clu3l9. 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 4 1
8 2 7
1 9 5
3 8 1 6
9 2 4
5 3
6 1 8 2
2 4 6 3
8 9 7
Hard #2
4 3 6 7
9 7 4 2 8
7 3 6 8 2
2 7 5
4
6 8
4 7 5
8 9 7
8 9 6
Hard #3
1 3 5 4 7
8 6 9 5
3 2 5 8
6 7 8
6 3
7 2 5 4 6
2 1 9
8 7 3
Hard #4
6 3 1 9
2 1 7
7
7 4 8 2 5
5 6 4 3
9 3
9 3 6
2 7 4
2 5 7 3
Hard #5
5 7 2 9
8 6 5
1 2 4
6 9 2 4 8 5
1 5 8 6
7
7 5
1 4
3 1 9 8
Hard #6
2 5
4 5 6 8
3 2 7
8 5 3 6
3 9 4 8 7
5 7
6 4 2 3
7 8 5
9 4
Hard #7
8 4
5 3 9 2
1 3
5 2 9
3 4 8
1 9 7
1 6 8 3
8 7 3
2 7 9 1 6
Hard #8
1 2
2 3 4 8 7
1 6 8 5
2 5
2 1 9 3
6 7 3
8 2 4 9
3 7 2
8 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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