Printable Hard Sudoku

Set 37b9ou. 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
6
8 2 5 6
9 7 3 2 1
4 3 1 5
1 7 8 9
6
4 3 6 9
1 5
9 6 4 3
Hard #2
5 4
8 4 2 3
7 3 4
8 3 1
5 6 8 2
8 2 9
1 3 9
9 8 6 2
4 5 7
Hard #3
7 8 1
1 7 6 2
5 4
7
4 9 8 2 6
5 8
4 7 3 6 2
5 9 7
2 5 8 1
Hard #4
6 3
2 9
8 6
7 2 3
5 6 8 7
2 4 1 5 9
1 8 2
9 2 8 5
4 5 3 2
Hard #5
5 4 6
3 6 7 1
4 7 6 8 3
3 6 7
5 2 1
8
1 7 6 9
9 3 7
5 9 6
Hard #6
8
4 3 6 5 2
5 6 4 9 1
8 5
1 9 2 5
9 3 2 4
4 7 6 3
6 7 2 9
Hard #7
6 3
4 5 2 3 6
5 1
9 8
9 1 3
7 4
7 5 1
2 6 7 9 8
3 5 1 8 9
Hard #8
8 5
4 5 6 9
4 8 2
7 5 9
3 9 1 8 6
4 2
7
3 2 8 6
2 9 3 7 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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