Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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