Printable Hard Sudoku

Set 15fslia. 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 2 6 7 4
4 6
2 9 1
9 2 1
2 4
4 7 6
2 5 1 8 3
5 6 9
4 8 1
Hard #2
8 9 6
2 1 8 6
5 2 7 9
7 8 5 3
3 9 5 4
3
4 8 2
4 6 1
2 6 3
Hard #3
1 2 3
4 5 6
6 3 4 7 8
8 9
6 2
9 3 5
4 2 9 1 7 8
1 4
7 9 1
Hard #4
4 9 8
1 7 9
1 2 6
4 1 7
3 7 8 1
6 5 9
5
3 8 6
8 5 9 1 2 4
Hard #5
8 6 3 1
4 7
2 5 8 4 7
1 2
9 3
4 6 9
8 1 2 4
5 4
3 7 8 6 5
Hard #6
7
1 6 5
3 7 4 9 1 8
8 4 1 3 6
9 2 8
6
6 3 2
5 1 6
9 8 5 1
Hard #7
4 6 8
8 2
9 3
1 9
2 5 9 6
7 1 2 4
4 7 1 2
2 6 8 5 1
5 8 3
Hard #8
3 4
9 2 4 5 1 8
5 3
8 6
6 2
2 1 4
8 2 9 6
2 5 9 4 1
1 6 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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