Printable Hard Sudoku

Set 1mz8dl0. 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
2 7 6
5 1 6 2
8 7 5 3
7 8 6 4
5 9 2 4 8 7
4 8
6 9 5 1
3 8
Hard #2
8 1 3 2 5 7
2 5 9
6 3
5 4 6 7 1 9
9
3
1 4
8 7 9
9 7 3 2 8
Hard #3
9 1 2 7 6 5 3
5 9 4 1
6 3 1 2
9 5 7
1 4
6 7 1 3
1 4 7 9
8
Hard #4
3 1 6 4 5 7
4 5 8 1
6 7 2
2 6
1 2
3 8 1 9
1 2
4 1 8
8 7 4
Hard #5
9 5 1
1 9
2 7 9 4
7 4 2
3 7 8
4 8 3
8 5 1 4
1 9 5 2
7 8 6
Hard #6
2 4 8
9 1 2 5
3 5 9
6 5
3 5 7 9
2 7 5 1
7 8
6 3 8 5 2
6 3
Hard #7
5 8
2 6 3 1 8 5
9 3 5 1 6 7
1
2 9
4 2 6
5 4 8 9
8 6 2
7 1
Hard #8
6 8
3 9 4 8 6
2
7 2
2 4 3 6
5 3 4 8
1 3 5
1 4 7
8 5 7 1 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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