Printable Hard Sudoku

Set 6n91e5. 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
8 6 7
7 6 4 5 3
2 1 6
1 3 2
7 6 2 8 1
9 5
6 9 7
5 8
4 5 6
Hard #2
9 3 1 2 7
7 2
8 6 1
5 3 7
5 9 8
4 1
7 5 6 8
8 5 4 6
4 7 3
Hard #3
8 5 7
3 7 1 5
9 6 8 1
2
9 8 3 2
1 2 9 6 8
4 6 7
3 4
4 6 7
Hard #4
4 3 9 2
3 7 1
8 7
8 1
4 7 9 2
6 2 7 8
2 5 4 3 6
3 1
8 6 4
Hard #5
4 7 6
2
5 9
2 4 8 9 1 6
9 3 5 2
3 5 8 9
1 8
1 3 5 8 9
5 4
Hard #6
6
1 7 3
4 3 1 6 9
1 6 7 8 5 3
2 4 6
8 5 9 7
2
9 1 2
6 5 2
Hard #7
8 2 1 4
9 7
3 6 4 9 5
1 4 8
2 6
8 3 4 9 1
5 9 4
9 8 1 6 7
Hard #8
3 6 2 8
6 9 5
1 2 7 5 3
2 3 5
3 1 6
5 4 2 7
5 8
9 5 7
1 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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