Printable Hard Sudoku

Set sbta5m. 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
3 8
6 7 4 5 9 3
5 7
5 7 4
2 8
8 9 1 6 7
8 4 7
5 8
9 4 2 5
Hard #2
2 8 5
6 4
3 1 2 7
5 7 4 8 2
6 4 1 9
3 1
5 1 7
3 4 2
8 1 2
Hard #3
1 3 5 6
5 7 9
2 3 1
2 3
9 5 8
8 6 7 1
8 7 6 5
2 8 6
5 9 2
Hard #4
1 9 3
5 6 4
8 7 1 2
8 2 7 5 6
6
7 3 1 8
9 5 3 1
3 2 8
8 9
Hard #5
4 9 8
1 9
7 9
4 3 8 6
2 7
1 6 5 3 2
8 6 1 5
7 5 8
8 9 2 6
Hard #6
5 9 3 6 8
6 2
3 8
8 5 9
3 4
9 6 7 4
7 6 4
4 1 9 7
2 4 9 3
Hard #7
9 7 3 4
7 9 6 8
1 3 5
3 6 7
2 3 9
8 5
1 2 9
3 8 2
6 2 7 1
Hard #8
5 1 4 6 8
4 9
5 8
2 8 6 9
1 9 6 7
9 3 5
9 7 1 4 5
1 5 3
6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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