Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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