Printable Hard Sudoku

Set 3lu9ef. 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
2 1 3
7 9 3
1 5 6 8
2 3 8 6 4
6 3 2 1
7 6 9
6 7 1
4 7
4 2
Hard #2
5 4 7 1
1 7 4 9
8 5 6
5 3
4 5 1 7
3 6 4 2
3 9
8 5 4
2 1 5
Hard #3
4 1 6
6 2 8
2
7 6 8 2 3 4
3 1 9 7 5
8 7
5 9 4 7
8 9 5 2
6
Hard #4
5 6 4
2 9
9 3 2 8 1 7 6
2 5
8 6 2 9
7 4
3 4 9 6
9 1 7
3 4
Hard #5
1 8 3 2 5
7
2 4 1
5 4
8 6 4
9 3 2 1 6
3 8 5 7
1 6 9
7 2 8
Hard #6
7 9
5 8 3
4 7 8
3 1 4 6 9 5
7 8 2
6 1 7
3 6 9
2 8 6
7 3 1
Hard #7
4 5 2
4 2 7
9 1 7 6
6 3 9
1 3 7 4
3 9 7 8
8 3 1
2 3 9
2 6
Hard #8
1
9 6 7 8 2
2 9 7 6 8
2 8 5
1 8 3 2
8 9 3 2
7 6 5 4 3
5 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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