Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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