Printable Hard Sudoku

Set oizb3b. 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
3 4 1 8
5 8 4 7
1 9 3
7 9
4 5
2 7 3
4 5 1 7
1 3 5 4 8
6 9
Hard #2
8 2
3 7 5 8
1 7 9
3 5
8 6 5 1
6 5 4 9
5 7 6
4 6 3 8
3 1 5
Hard #3
7
2 6 8
4 8 9
9 1 7 3 8
3 5
6 7 9 2
1 6 2 7 5
2 5 4 1
4 1
Hard #4
5 6
5 3 9
6 1 9 3 8
9 5
9 2 4
4 2 1
4 9 8 5
4 7 1
6 3 2 7
Hard #5
9
4 3 7 5
9 5 2
2 6
8 7 9 6
6 2 3
9 4 8 2
5 7 9 4 1
2 5 6
Hard #6
2 6 1 3
9 5
7 2 3 6 4 9
8 3 4 2
5 9 7
1 8 5
8 9
9 2 7 8
3
Hard #7
8 7 1 6 5
6 7 9
5 3 7
4 7 9
1 2 8
5 1
2 6 8 1
2 9
3 1 6 8
Hard #8
1 8
2 9 7
5 3 6
5 3
6 3 7
6 2 9
6 5 8 4
4 3 9 8 1 7
7 4 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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