Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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