Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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