Printable Hard Sudoku

Set pu6gb4. 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 5 7
4 1 8
1 9 8 5 3
7 5
7 8 9 4
1 5
8 3 9 7
2 6 3
4 6 5
Hard #2
6 7 5 9
3 2 8 1
4 6 8
6 8
4 8 6 2
9 3 7 5
5 2 7
6 1
3 9 4
Hard #3
9 1 7 3
6 9
8 5 4
2 4 3 9
3 7 6 2 5
8
4 5 9 8
2
9 8 1 7 6
Hard #4
2 1 3
4 3
1 2 6 9 5 8
7 8
5 6 4 2
7 3
7 3 1 2
6 9 2 4
2 8
Hard #5
8
4 9 1 6
5 7 4 1 3
1 2 5 9 4
9 8
2 9
1 2 5
6 7 5 3 8 4
6
Hard #6
3 5 7
5 3
8 9 6 7 1
9 5
6 2 1
1 5 4 2
4 7 9
2 7 8 1 5
2 6
Hard #7
2 8 5 1
6 2
4 1 5 3
5 2 6
3 4 8 5
8
9 3 2
4 8 7
6 7 1 3 4
Hard #8
6
4 8 5 7 9
3 7 2
5 2 7
6 5 4 1 8
9 7
1 5 9 2
6 1
4 1 5 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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