Printable Hard Sudoku

Set 27h20i. 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 6 2
6 3
4 8 7 6 5
9 5
3 4 7
4 8 1
5 9 2
6 2 5 1 4
8 7
Hard #2
5
1 9 3 7
8 5 9
4 7 5 8
8 9 1 3 6
1 7
4 7
7 6 9 3
2 3 7 1
Hard #3
5 2 6 4 8
6 9 1
3 6 9
1 7 3
8 2 6
2 7 6 9
9 2
3 9
8 5 4 6
Hard #4
5 6 2
7 3 2 8 5
5 9
9 2 6 3
5 8 1
4
5 7 4 6
4 3 5
1 6 8 2
Hard #5
2 5 1
5 4 6 9
2
6 7 5 9 1 4 8
5 1 2 6
7
3
2 4
8 5 7 6 3 9
Hard #6
2 9
8 6 5 4
9 6 7
5 8 3 6
9 6 1 7
4 5
2 5 8
6 8 5 7
9 1 2
Hard #7
2 5 1
5 2 1 9
5 6 7
3 9 5 8 4
8 7 6 3
1 9
3 9 6 4
5 2
9 2
Hard #8
2
6 2 7 8 1 9 3
1 9 8 2
9 8 6
4 2
6 5 4 2
3 1 8
9
9 2 3 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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