Printable Hard Sudoku

Set 1s7t185. 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 7 4
4 5 8 7
8 1 2 4 9
6 9 4 2
5 1
9 3 8 2 6 5
7 3 9
2
Hard #2
4 1 9 8 5
8 4
9 4 5 3
7 1 2 6
8 9 2 3
1 4 9
4 5
7 6
2 1 3
Hard #3
6 3 4
4 6 5 3
9 3 4 1 2
5 7 2 8
4 2
8 9 1
6 8
6 3
4 9 6 5
Hard #4
7 3 2 6
1 3 4 5 2
5 6
9 6 2
8 7 4
8 7 5
6 1 7
5 2
7 4 5 9
Hard #5
1
2 3
9 1 2 6 5
4 6 9
1 7 8
8 1 3
4 2 3 1 9
6 5 4
9 4 5 8
Hard #6
3 8 7
7 9 5 8
2 8 1 5
2 9
1 4 8 5
4 6
3 6 4
6 7 2
5 1 9 7
Hard #7
7 2
8 3
9 3 8 1 7
4 5 6
1 9 5 7
8 4
3 6 5 4
2 8 9
6 5 7 8
Hard #8
2 3 4
1 2 8
7 4 8
3 5 9
9 2 1
6 4 5 9
2 7 8 9
7 3 4 1
5 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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