Printable Hard Sudoku

Set 17p844o. 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
7 6
8 5 9 7
1 9 7 4
4 3 8
5 6 2 3
2 8 5
9 2 7
2 6 3
4 7 3
Hard #2
8 2 4 1 3 7
2 5
9 7
7 5 3 8 6
8 5
1 4 9 3
7 9 8 1
8 9
3 1
Hard #3
9 5 3 6 7
6 2 9
8 6
4 1 8 2 6
7 9 1
5 4
8 6 1 7
4 7 9 2
2
Hard #4
9 3 5
2 1
3 2 6 8
3 2 9
2 6 7
9 4 5 6
7 3 1
9 5 8
1 4 6 7
Hard #5
3 8
2 4 6
7 5
6 3
5 1 3 2
2 6 9 5
2 1 7
3 9 2 5 1
1 3 8 4
Hard #6
6 3
1 8
4 5 2 6
8 5 3
9 1 5 2
6 2 9
2 9 8
5 6 9 8 7
7 3 5
Hard #7
8 6 2 1
4 1 2
9 6 5 4
4 1 8
6
3 7 5 2 9
3 8 4
1 7 3
9 4 2
Hard #8
6 2
8 1 6 7
8 7 3 5
9 4 6
8 3 5 7
7 4 9 2 8
9 5 6 2
6 1 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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