Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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