Printable Hard Sudoku

Set 1a08t53. 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
1 3
5 8 9
4 7 6 5
1 3 9
4 5
6 1 9
9 1 2 7 6
8 5
2 6 1 5 7
Hard #2
6 2 5 9
4 6
3 7 1
5 7
7 4 6 9 3
3 1 8
3 5 9
9 7 5 1
6 1 8
Hard #3
9 5 3
2 4 1
3 6 9 7
7 5 1 8 4 9 2
6 2 9
8 3 5 4
1
3 6 1 7
Hard #4
9 8 5 3 6 2
2
4 1 7
9 4 8 3 1
7 6 4
5 9 2
6 7 8 2
2 4
3 9
Hard #5
7 5 4 3
5 3 6 2
1 6 3 9
4 8 7 1
8 1 7
5 9 6
3 2 9
4
9 2 8
Hard #6
8 7
9 3 6
6 1 5 4 7 3 8
9 3 2
6 9
1 4 2 5
3
4 6 7
1 5 3 4
Hard #7
6 9 2
1 6 8 9
8 9 4
5 2 1 3
1 6 5
3 8 2 7
2 8 3
9 6
7 4 5
Hard #8
3 9 4
1 8 3 2
9 7
4 7 5
6 9
9 1 5
5 7 2
1 8 3 5
8 4 2 5 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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