Printable Hard Sudoku

Set ww9sif. 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 4
3 7 4 2
8 9
8 6 5 1 7
1 8
5 9 1 6
6 9
4 2 7 9 3
5 3 1
Hard #2
1 4 5
9 8 6 5
5 2 3 9
3 6 5
7 8 1 9
2 3
7 1 8 3
1 4 5 2
8
Hard #3
1 2 9
3 5 8 7
8 4 3 7 2
8 1 5 3
6 4
4 2
5 8 3 2 7
6 1
3 9
Hard #4
2 3
7 2 9 1
9 4
3 9 7 8 5 2
5 1 7
4 3 9
5 8 4
6 9 2
1 4 2
Hard #5
2 9
2 7 1
7 6 1 8 5
3 8 1
6 9 8
8 7 9 2
5 2
2 1 3
5 1 3 7
Hard #6
6 3 4
2 8 5 9
1 4 2
8 3 1
7 2 1 9 8
4
3 8 4 1
9 1 2 5
5 3
Hard #7
6 9 7
6 8 3
2 3 5 8
2 1 8 6 3
7 9 4
8 6 5 9
1 8 4 5
4 3
9
Hard #8
4 9 5 3
7 2 8
6 5
7 5 9 8 3
3 7 6 1
1 9 6
4 2 8
9 8 4
3 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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