Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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