Printable Hard Sudoku

Set ve99t1. 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 6 9 1
5 9 7 3
5 6
6 9 4 8 7
5 6 4 8
7 9
4 1
6 3
7 3 2 1
Hard #2
5 7
4 8 2
9 7 2 8
7 4 3
8 4 9 1 7
5 3 1
1 8
5 7 6 9
3 9 7
Hard #3
9 6
4 3 9 5 8
2 8 5 6
6 7
3 1 5
5 9 6 3 4
2
9 3 7 2
6 1 4
Hard #4
6 8 7 5
1 4 8 3
3 5 1 6
1 6 7 2
7 5 4 8 1
6 7 4
6 9
3 8 5
Hard #5
5 8 7 1
3 4 5 8
1 3 7 4 9
5 8 2 6
2 7 9 5
1 3
5 4
2 6
6 9
Hard #6
5 6 7 8
1 9 2 4 6
2 7
6 2 3 1 9
8 1 2 3 5
9 8
7 9 3
5
1 8
Hard #7
1 9
2 1 7
7 1 5
4 5 9 1 8
5 7 8 3 1
3 7 6
9 2
6 1 7 4
8 5
Hard #8
9 8 7
3 7 1 4
3
4 8 3
9 6 4
3 2 5 7
5 3 8
1 6 9 8
3 1 7 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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