Printable Hard Sudoku

Set 7ntl36. 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 7 8 4
1 9
3 6 4 2
2 6 4
6 5 9
4 3 7 2
8 4 1
8 5
7 5 2 9
Hard #2
4 3
2 8 5
5 1 9
9 4 6 5
2 4
4 5 3
7 5 3 9
8 9 2
3 1 4 8 7
Hard #3
7 8 5 4
3 2 1
8 6 5
1 5 3 7 6
8 9 3
8 4
9 7 5 1
8 9 2
7 3
Hard #4
2
2 1 6 5 9
5 7 3
4 8 6
8 6 2 1
7
3 4 9 5
1 7 3
1 9 6 7 8
Hard #5
4 1 7
6 5 8 1 2 3
2 7 6
4 2 7
3 9 6 8
1 5
8 5 4 7
8 2
5 4
Hard #6
2 7
2 6 4 1
1 3 6 9
8 9 5
4 6 8
3 1
9 3 6 4
4 8 2 1 3
2 5
Hard #7
1 4 7
2 8 4 3
3 7 2
9 4 3 7 2
6 5 8
8 2 1 3
8
2 9
1 4 5 3
Hard #8
7 6 8
6 1 4 3
9 4
4 1 2
3 2 5 6
8 3 5
1 5 8 7
7 1 4
8 9 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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