Printable Hard Sudoku

Set 9volu2. 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
9 1 2 7 3 8
1 7 3 2
3 7 6
3 9 4 5
1
5 4
8 9 2
6 5 3 4
7 2
Hard #2
9 8 5 4
4
3 9
4 8 9
1 6 5 7
3 9 5
9 4 7 1
5 1 2 6
7 3 2 4
Hard #3
8 5 3
1 7
7 3 6 8 4 1
9 2 4 6 8
6 1 2 4 3
8
1 4 9
7
3 6 7
Hard #4
6
6 1 3
4 8 5 3
5 6 4
1 6 7 2
4 1 8 9
5 3 2 8 6
1 3 7
7 4
Hard #5
3 1 5 9 4
6 7
6 9 2 7 4 3
5 1 2
6 8 4
7 5
1
6 8
8 4 3 1 5
Hard #6
3 4 7 6 9
1
8 1
9 5
7 8 5 4
9 5 4 1 3
2 7 5
4 5 6 8
3 9 2
Hard #7
1 8 7
8 3 5 9
2
8 9 5
6 8 2
1 7 4
4 2 7 1
2 1 7 5
7 3 8 6
Hard #8
1 5 6 2
2 6 9 5 8 4
9
8 9 7 3
7 4 2 9 8
7 3
5 9 1 7 6
2 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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