Printable Hard Sudoku

Set 9330eh. 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 5
9 1
3 7 8 1
5 6 9 1 4 7
1 6 4 3 2
4 3 7
7 3 2 4
8 9 6
Hard #2
3 6 5
2 4 9 1
7 2
5 3 6
2 3
7 5 2 8
5 7 6
9 6 5
2 5 1 7 3
Hard #3
4 3 9
8 2 1 3
7 6 4 9
7
9 8 1
1 8 4 2
3 2 9 4
8 2 5 6
7 1
Hard #4
9 3 5
4 8 7
3 1 6
3 2 8 9 4
7 1 5
8 4 6
3 8 4 1
7 2 4 8
5
Hard #5
2 7 8 4
6 5 9
8 2
2 4 9 5 7
8 1
9 3 5
5 2 8
7 8 9 2 1
6 7
Hard #6
5 9
6 4 2 7
5 1 3
2 1 8 7
9 3 6
8 3
5 9 8 4 7 1
4
6 7 9 5
Hard #7
8 6 9 1
7 3 1 2 9
8 4 3
1 2 9
9 3 1
4 5 6 2
9 4 5
3 4
1 4
Hard #8
3 2 5 8 1
8 2 4 9
8
4 1 6 5
7 3 6 4 9 1
9 3 4
7 1 2
9
5 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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