Printable Hard Sudoku

Set 4xl683. 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 2 8
1 9 4 6
3 7 1 5 8
4 9
5 7 6 4
8 5
7 2 4 5 3
2
6 8 7
Hard #2
6 5
5 2 6 3
2 8 9 6
8 6 4 7
1 4 7 6
3 8
5 4
3 6 5 9
2 3 1
Hard #3
1 5 8 7 9 2
7 5
4 5 8
3 1 5
4 5 6 2
7 6 4
3 2 8 4
2 3
7 3
Hard #4
9 3 7
7 1 5 6
8 7 3
9 7 8 3
1 5
5 7 2 1
8 5
7 6 9 1
3 4 7
Hard #5
1 4 8 9
1 9
4 3 5 7
3 6
5 7 9 2
2 4 8 7 5
8
9 4 6 3
9 6 2
Hard #6
5 8 1 4
3 6 8
6 8 1 3 7
7 9 6
2
9 5 7
1 8 6 9
7 3 9 2
4 2
Hard #7
3 2 9 1
9 8
9 3 7 2
8 3 5
3 6 1 4
8 6 7
5 7
5 7 9
4 1 9 7
Hard #8
4 7
9 5 3 2 1
7 2 3 8 4
7 8 2
4
6 9 3 2
6 4 9 1
5 8 7
9 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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