Printable Hard Sudoku

Set 12d1175. 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
9 3 2 8 1
7 5
5 4 6 3
7 4
6 7
3 1 9
2 8 5
3 4 9
8 6 9 5 3
Hard #2
2 7 9 6
9 3 8 4
1 5 7
5 2
3 4 2 7
8 9
7 6 4 1
6 4 5
3 7 6
Hard #3
9 2 1 3
5 7 1
4 1 6
7 6 8 3
5 4 9
6 3 2
3 7 9 4
4 3
6 2 5
Hard #4
4 9
9 5 6 4 1
2 5
1 4 8 6
4 8
1 5
1 2 7 3
3 8 9 5
4 5 9 6
Hard #5
8 3 4 2 7
2 6 5
9 5 6 1
2 3 8
9
4 5 3
5 8 1
2 1 7
3 1 6 8
Hard #6
2 6 8 5 3
9 2
7 4
6 8 9
7 2
2 9 3 8 4
1 6
7 8 6 9 1
2 4 8
Hard #7
1 7 8 2 3
5 4 9 6
9 5
5 3 1 4
1 4 8
4 2 3
3 4 7 9 1
2 8 6
Hard #8
9 1 6
4 6 7
3 7 4 8 5 1
4
7 2 4 6
3 2 9
8 2 5 4 9
5 3 8
7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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