Printable Hard Sudoku

Set net042. 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 7 5
6 5 7 9 1
9 6
3 7 5 4
1 4 3
2 6
4 2 5
1 4
8 6 4 5 3
Hard #2
8 1 6 7
2 1 6 3
6 5 9
2 1 8 3
3 5 9 7
6 1
5 6
1 3 8 5
7 9
Hard #3
9 3 4
6 4 5
7 2 1 8
8 7
1 5 9
2 9 1
3 8 7 9 1
7
5 6 1 2 7
Hard #4
2 5
9 4 3
8 4 5
9 8 4 2
7 6
3 5 1 7 8
3 9
7 3 1 6
5 2 7 4
Hard #5
6
1 5 2
9 2 8
7 3 6 5
4 5 3 6
5 6 9 7
9 2 8 7
6 5 9 4
8 6
Hard #6
5 7
2 5 7 6
4 9 8
8 7
4 7 6 2
6 1 4 9
9 6 3 4 2
2 8
1 9 3
Hard #7
8 7
1 2 5
3 7 4 5 2
5 4
1 8 6
3 1
7 2 8 5 1
8 9 4 7 3
9 2
Hard #8
9 4 2 8 1
5 1 4
5 3 8
8 7 2
1 2 4
6 3 7
4 2
8 3 5
3 5 6 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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