Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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