Printable Hard Sudoku

Set s9d39l. 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 1 2
3 7 5
7 6 9
8
2 1 9 8
5 3 1 4
4 8
7 8 2 5
1 9 5 6 2
Hard #2
8 6 2 7
3 7 6
5 9 7
2 8 5
7 6 1 9
6 3 7
4 3 8 6
7 1
6 5 4
Hard #3
4 6 1
5 4 8 6 9
3 1
5 6
2 5 7
9 6 8 5
3 6
7 6 3 5 1
1 3 7
Hard #4
2 7 4 3 8
4 1
3 5 6
7 9 6 1 5
3 5
1 3 6 9
2 9 1
6 7
8 3 2
Hard #5
5 8
4 8 3 1 5
6
3 4 1 7
2 6 8 1
8 2 4
7 8 9
6 2 7
8 3 5 1
Hard #6
1
6 5 8 3 4
2 9 8
5 8 2 1 3
6 3 9 4
7 1 8 6
4 5 2
5 6 3
4
Hard #7
6 2 8 1
3 2 7
7 3 9
8 4
3 1 5
4 5 6
1 9 7
4 1 2 9
7 8 5 6
Hard #8
2 1 3
9 6 2 7 1 4
5 4 6
5 6 4
7 2
4 1 3 9
1 7 2 8
3 8
6 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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