Printable Hard Sudoku

Set ierkj9. 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
1 7 3 5 8
4 7 2 1
9 7
3 4
6 4 9
2 7 1
6 3 9
7 4 5
8 9 4 3
Hard #2
7 3 5 8
5 4 3 7
3 2 1 6
7 2
9 6 7
5 3 8 1
7 1 2 5
5 7 6 3
Hard #3
9 4
5 4 7 2
4 6 7 1
4 5 2 9 7
3 5 6
1 3
1 8 5 6 9
8
7 2 5
Hard #4
5 4 3 8
1 8 5 2 6
7 5 3
4 2 3
8
6 3
5 9 2 1
1 8
4 6 2 1 8
Hard #5
9 8 3 2 5
7 5 1 6
1 6 4
8 9 5
3 9 2 7
6 3
6 2 7 3
4 8
8 4
Hard #6
1 5 7 8
8 3
9 7 2 4
2 1
6 4 3
9 1 7
7 3 6 1
4 7 3 2
8 2 6
Hard #7
9 7 1
6 9 2
9 8 7
8 2 3
2 6 5 1
9 7 6 5
3 1
6 7 3
5 7 2 3
Hard #8
1 7 3
6 4 9 5
9 4 3 6
4 1 2 8
5 9 3 7 4
5
6 9 4
2 1 5
8 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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