Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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