Printable Hard Sudoku

Set 1dah3s8. 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
8
8 9 6 1
4 1 6 5 3 2
6 3
8 2 9 7
4 8 9 5
3 4 8 1
5 3 4
2
Hard #2
6 4 5 2
8 1 3
1 9 6
4 1
1 6 4 2 5 9
9 3
8 9 4 6 2
8
2 1 4
Hard #3
3 6
2 9 6
4 7 3 2
5 1 3
4 5 3
2 4 5
2 7 9
9 6 5 4
8 3 2 9
Hard #4
3 8 7 6
6 8
7 2 1
8 6 2 4
5 9
2 4
1 9 2
1 2 9 3 8
2 9 3 4
Hard #5
3 5
1 6 7 4
6 4 7
1 7 6 5
8 9 1
8 3 9
7 6 9 4
5 3 6
4 2 7
Hard #6
7 4 8
8 3 1
6 1 2
3 9 5
8 6 1 5 3
5
9 5 2 6
3 2 1 4
6 4 8
Hard #7
7 3 1 6
8 9 5 1 3
6
2 3 9 4
3 7
8 6 9 7
9 8 5 2
4 5
9 8 4
Hard #8
7 2 8
4 3 7
7 5 1
3 1 6 9 5 4
5 2
8 1 4 9
1 6 9 7
5 6 4
5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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