Printable Hard Sudoku

Set 1u3jfuc. 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 1 5 6 4
4 3 1
2 7
4
5 3 7 9 6
8 7
8 9 5 3
2 3 5
5 1 6 2
Hard #2
5 7 6
4 9
8 6 7 2 4
9 1
6 8 2
3 4
4 7 1
1 8 9 3 7
5 6 8 4
Hard #3
1 8 4
6 4 5 7
5 4 2 6
8
8 9 1 7
1 2 5 6
7 1 9
8 6 5
4 2 9
Hard #4
4 9 6
2 7 4
8 2 9
4 3 1
7 9 1
8 1 4
6 9 1 4
3 7 8 2
1 3 2
Hard #5
1 9 8 2
3 4 8
6 2 1 3 7
5
2 7 3 8 5
1
6 1 8 7 4
8 1
3 4 2
Hard #6
5 7 2 4
1 4 5 8
4 7 6 8
3 9
9 4
9 2 7 3
3 5 4 7
9 6 8
1 4
Hard #7
3
7 6 2 1
3 2 1 8
6 8 3 5
4 6
9 4 8 7 5
3 6 9 7
8 7 3
4 6
Hard #8
8 4 6
8 2 5 9
6 4 7 2
1
9 3 2
2 5 6 1 8
6 8 9 1 2
7 3 6
8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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