Printable Hard Sudoku

Set o2u3ri. 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
6 3 2 7
9 5
3 1 7 9
2
5 9 4
7 6 2 8
9 5 3 4 6 8
7 3
7 1 5
Hard #2
9 1 7 5
2 3 1 4
4
2 8 6
2 7
7 8 9 4
4 2 9
6 5 8 1 3
7 8 5
Hard #3
1
4 5 7 3
2 4 9
9 4 6 1
3 1 9 8
6 3 1
7 5 4
8 1 9 7
5 7 6
Hard #4
7 9
9 7 5
1 9 2 8 6
2 7 6 8
9 7 3
1 4
8 4 2 1
4 6
6 2 1 3
Hard #5
5 3 9 1 6
8 4 1 6 3 9
6 2
3 5 7 4
5 8 7
8 2 6
1
6 2 1 5 8
Hard #6
7 5 3 1 8
7 2 5
4 6
9 8
4
9 5 7 3 1
3 9 6 2 7
7 3 4
7 1 5
Hard #7
6
5
4 7 2 3 6
9 7 1
5 9 2 4 7
8 5
6 4 8 3
2 8 9
7 6 4 3 5
Hard #8
7 8 9
1 2 7 3 8
3 4 1
9
3 8
6 4 5 3
7 8 5
1 5 7 2 9
3 2 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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