Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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