Printable Hard Sudoku

Set 7k304h. 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
7 5 2 4
1 4
3 9 5
9 8 6 7
1 7 5 8
6 8 2
2 4
5 3
3 6 8 1 9
Hard #2
4 8 9
8 7
5 2 4 8 6
9 5 2 3
8 1
3 6 8
4 5 9 7
2 5 6 1
4 3
Hard #3
8 6
9 8 2 1
5 3 9 8 6
2 5 4 9
6
4 9 1
3 1 4 7
9 3
4 3 2 5
Hard #4
2 7 8
3 9 5
5 6 2 9
1 6 4
3 2 9 7
9 6 1
8 3
5 7 6
9 6 2 4
Hard #5
9 4 6 2 5
1 7 9 4
5 8 9 7
8 1 3
5 7
3 5 8 2
1
2 8 4 6
4 2
Hard #6
4 8 9 2
8 2 9
7 1 4 5
4 8 5 6
3 5 8 6
6 9 1
8 7 1
8 4
6 9
Hard #7
5 3 1 8
9 2 8 3 6
4
8
2 6 1 5 3
1 8
9 4 5 3
1
5 1 3 9 2 8
Hard #8
5 4 8
8 9 5 4 3
3 6 1 5
3 7 4 1 6 9
3 5
6 9 5
8 7
6 7 8 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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