Printable Hard Sudoku

Set 15wnhzs. 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 3 4
8 4 1
4 5 2 7
3 6
8 1 2 6 9
7 8
5 9 1
3 5 6 1
6 7 9
Hard #2
4 9 8
1 8
8 2 6 1 4
9 4 8 7
5 6 1
6
8 9 5
2 8 7
3 7 4 2 6
Hard #3
7 1
1 4 8 3
8 5
7 9 6 2
3 5 6 7 2
3 1
6 3 7 9
1 8
5 8 6 3
Hard #4
2 7
2 5 7 1
5 3 8
9 5 8 4 6
4 1 8
4 3
8 9 7 5
1 2
9 8 3 6
Hard #5
9 8 7
5 1
3 4 2 8
8 5 3 4 2
7 5 1
2 1 6
2 4
3 8 2 5
9 2 1
Hard #6
5 2 6 3 8
8 6 7
8 1 9
8 1 2
5 3 7 9
7 9 1
5 3
2 6
5 9 3 4
Hard #7
2
7 6
7 3 6 2 9
8 2 7 5
5 8 3 4
6 2 8
6 3 8
1 3 6 7
4 9 5
Hard #8
9 4 2 7 1
2 4 8
1 9 7 4
8 3 5 9
7 5
9 8
8
1 2 9
3 4 2 6 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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