Printable Hard Sudoku

Set 17xef4c. 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
3 8 6
1 5
6 1 9 3
5 3 6
2 1 8 4
9 2 7
6 8 4
3 2 1 8 5
3 4
Hard #2
7 2 5
9 8 3 2
6 4
1 9
5 2 3 8
6 7 4
8 7 5 4 3
6 9 8
1 2 7
Hard #3
8 9 5 2 4
7 3 8
2 1 6 7
2 7 6 5
8 9 4
7 9 6
2 5
5 8 2
1 9
Hard #4
9 4 6 2 7
8 2 4
3
1 4 8
6 8 5 2 1
2 3 8 6
2 6 5
5 7 8
7 1
Hard #5
4 1
9 5 6 8
7 2 8 3 4
2 7 6 5
6 7 2 4 1
3 9 7
9 3
5
5 1 7
Hard #6
7 5
8 1 9 2
5 1 9 6
7 9 1
1 4 7 3
3 2 1 8
2 6 5
8 3
9 1 7
Hard #7
4 8 3
9 5 3 4 2 1
6 9
2 8 7 6
9 4 3 1
1 9
9 8 6
4 8
2 7 4
Hard #8
4 8
7 9 2 3
1 3 6 7
2 6 9 5
6 5 1
7 2 8
3 6
1 7 5
2 5 1 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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