Printable Hard Sudoku

Set 1n1o57h. 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 5 4
9 5 3
8 4
8 3 7 5 6
3 9 2
1 2 5 9
1 6
6 2 8 5
5 1 7
Hard #2
9 7 2 8 5 1
8 4 6
3 6 9 8
4
2 9 3 5
5 2
1 9 2 7 8
7 5 1 2
Hard #3
1 9 6
1 8 2
7 3 1 5
6 2 4 8 5 1
3 9 4
7
9 2
1 8 6
7 2 3 9
Hard #4
7 9
4 1
3 8
5 3
4 1 3
8 7 1 2
9 4 5 2 1 8
9 7 6
1 6 3 8 4
Hard #5
4 5 6 2
9 8 2 4 7 3
7 9
3 5 8
4 8
3 1
8 1 9 5
5 1 3 4
9 6
Hard #6
6 8 2
1 5 2
8 1
3 8 2 7
6 8 3
5 7 1 3
3 9 4 7 5
9 2 3 7
2
Hard #7
4 9 3 8
5 6 8 1
7 1
6 2 8 4 5
3 4
1 5 3
7 9 6 1
9 1 8
5 6
Hard #8
5 8 4
3 7 1
4 5 6
4 2 6 3 5
7 4 2 9 6
3 6 5 1
6
3 1 9
5 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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