Printable Hard Sudoku

Set 6251uf. 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
5 3
9 1 8 6
6 8 4
2 9 4 6 7
4 8
6 2
5 1 6
8 1 7 4 5
4 8 9
Hard #2
2 8 6
1 8 9
7 9 5 2
8 5 3 2 7
7 8
6 9 2
3 1
5 2 1 6 4
5 4
Hard #3
5 9
9 6 3 4 8 1
7 6 9
2 7 4 6
9 5 4 2
4
1 7 3 5
7 8
4 6 2
Hard #4
5 3 9 8
4 9 5 7 3
6
9 7 1 8 5
8 4 3 9 7
4
7 4
4 2 8
7 6 8
Hard #5
2 9 7 3
4 9 7
1 8
7
1 3 6 4 9
4 2 8
8 5 1 6 2 3
2 5 1 9
4
Hard #6
2 1 3
7 3 9 5 2
5 6 1 2 7 9
3 5 1
2 7 3
5 8 4
4 6 5
4 6 7
Hard #7
4 1 7 9
8 4 6
1 8 5
7 6 1
5 4 3
8 7 6
4 1 7
9 2 3 8
5 8 3
Hard #8
7 1
6 3 8
5 2 8 1 9
2 5 4 1
2 5 4
4 7 5 1
5 4
4 6
8 1 9 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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