Printable Hard Sudoku

Set 6hmmg4. 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
7 4 9
2 6 4 7 1
5 4 3 9
7 3 4 2
1 2 5 4 7
9 8
1 2 3
4 7 8
Hard #2
8 4 5 6 1 3
9 2 4
2 3 1 8 7
9 7
5 7
4 1 8
4 9 7 5
3 6 5
8
Hard #3
3 4
8 1 9 7
6 7 4 1 3
4 2 9
6 8
9 3 4 1 5
5 7
6
7 3 1 2 4
Hard #4
2
9 6 7
1 4 9 6
8 6 7
7 1 5
3 4 8 1
9 3 8 6 5 1
4 5 3
6 3
Hard #5
2 5 6
6 5 3 8
8 7
8 9 2
5 4
4 9 1
2 9 4 8
1 4 9 2
4 1 7 3
Hard #6
3 8
8 7 9
3 7 2 1 4
9 7 6 4
1 2 8
2 5 1
3 5 6 9
1 3 5
3 8
Hard #7
5 1 3 9 6
6 5 4 1
4 2 7
6 1 7
3 6 5
1 8
7 2
9 3 1 4
9 8 5
Hard #8
2 8
9 8 2 5
1 4 3
6 5 9 8
4 9 7
5 8 6
4 1
6 2 7 9 8
5 9 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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