Printable Hard Sudoku

Set 5c9r2o. 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
5 1 3 9 4
3 1 6 2
9 4 1
9 4
4 7
1 6 8 5
8 4
7 6 2
6 4 3 7
Hard #2
2 8 6
4 3 8
3 7 9 5
4 3 1 8 2
8 5 7 1
7 6 8
6 1
9 3 8
4 7
Hard #3
8 2
1 6
2 5 4 1
9 4 7
2
1 5 3 2 8 9
9 7 5
3 4 1 5 2 8
8 4
Hard #4
4 5 6 3
8 3 1 5
1 2 8 6
5 4
2 1 7
6 4 8 9 2
7 6 9
2 5 3
8
Hard #5
2 6 5 7
8 4 3
4 9 8
3 6
6 7 2 1
5 2
7 8
6 3 4 1 5
1 8 6 7
Hard #6
4 6 7
5 7 8
2 7 1 4 5
7 2
5 8 3 7 6
1 9 8
2 1
3 5 9
8 5 3
Hard #7
3 5 7 1
7 1 3 4
1 8
1 5 7 8
3 4 9
6 2
7 1 6 5 9
1 4
9 2 1
Hard #8
1 2 8 9
5 9 3 6
4 5
4 9 8 6
3 7 1
1 3 2
2 7 3
3 6
9 8 2 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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