Printable Hard Sudoku

Set 152kndf. 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
5 1 2
8 5 6
2 3 9 7 8 5
2 4 9 6 7
1 4 9
1
8 6 7
2 6 5
9 2
Hard #2
1 5 3
4 7
4 1 8
8 5 4 1
7 1 9 8 5 6
6 9
3 2 9 8
5
5 3 2 6
Hard #3
2
8 5 1 7
4 9 6
5 2 6
6 1 4
9 7 6 8
1 6 9 8 2
2 7 3 5
5 1
Hard #4
1 6
9 4 8 6
2 9 4
4 8 5 6
7
7 9 5 3 1 8
6 5 7
2 4 8 7
8 1
Hard #5
1 9 5 3
9 2 3
5 8 4
8 6 4 3 2 1
4 6 8
7
1 9 7
7 8 9 4
3 6
Hard #6
9 1
3 2 5 1
1 6 7 8 4 9
9 2 3
1
7 8 5 4
7 3 9 6
4
6 9 8 1
Hard #7
3 9 6
1 7 5 4
6 3 8
3 1 9
5 9
7 2 6 5
8 5
1 5 4 2 8
9 3 6
Hard #8
6 7 3 9
5 1 9
2 4 1 8 3
4 6
6 3 5 7
8 1 3
2 7 9 4
3 5 4 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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