Printable Hard Sudoku

Set 1kf51nd. 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
1 4 3 9 6
7
3 4
8 6 9
6 4 2 5
9 4 8 6
3 9 4 7 1
8 5
5 1 2
Hard #2
6 4 5
5 7 8 1 3
3 8 1
2 4
6 1
5 9 4 8
9 7
3 5 2
1 4 2 7 6
Hard #3
4 1 3 9
9 1
5 8
3 2 6
1 2 9 7 5 3
5 7 8
5 1 6
4 6 7
1 3 9
Hard #4
3 7
7 9 2 5
8 7
3 1 2
1 6 7 9
5 7 8 6
4 6 9
2 1 8
5 6 4 7
Hard #5
9 5 2
4 2 3 7 8
3 6
2 6 4 1 8
5 3 9 2
5 8 1
7 9
2 5 3 9 7
Hard #6
4 8 5
9 2 1 7
1 7 3
4 9 6
9 6 8
6 8 5 2 4 9
5 1 2 8
5 6 9
Hard #7
3 1
7 2
1 3 7 6
8 9 7
5 7 9
1 3 4
4 6 2
9 4 8 5 1
1 4 8 9
Hard #8
3 1 2
8 1 5
9 8 4
6 2 8 4
1 6 8 3
5 7 6
7 6 2
9 5 1 3
1 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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