Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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