Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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