Printable Hard Sudoku

Set 107secv. 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
1 3 8
7 3
8 5 7 9
3 4
9 2 8 5
6 4 8 7 1
7 1 3
4 2 7
2 9 8
Hard #2
6 2 3 7 4 5
8 6 7
9 4
4 1
3 5 8
1 7 8
9 6 1 3
5 6
7 4 2 5
Hard #3
1 5
2 3 9 8
9 8 7 1
5 8 7 1 6
1 3 5 7
3
6 9 8
3 5 7
3 6 9
Hard #4
7 1 3 5
2 4
6 3 9
5 4 2
2 6 8 4 1
7 5 6
8 1
4 9 5
1 5 2 8
Hard #5
6 8 4
1 2 5
2 4 3 9
2 4 1
4 8 3 6
1 9 5 3
3
9 6 8
4 5 8 7
Hard #6
1 9 3 8 4
6 1 9
8 7 3 1
2 6 3
6
7 8 4 3
4 5 1
3 9 5
1 7 2
Hard #7
6 4 7
5 8 9 4 1
8 2
7 4 2
7 3 1 5 6
1 9
4 2 9 8
3 7 8
3 7
Hard #8
3 6
9 4 2
4 2 9 1
6 2 4 8
7 9
8 5 6
5 6 1 4
9 5 7 8 2
3 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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