Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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