Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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