Printable Hard Sudoku

Set 1lt78gt. 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
7 4 8 9
3 6
1 5 3
8 3 4 6
6 3 4 2
6 7 3 1 9
8 5
5 9
1 6 2
Hard #2
5 9 4
7 6
3 8 6 9 1
9 6 3 4
5 9 6
7 5 3
3 1
9 4 8
2 7 4 6
Hard #3
4 5 3 2
6 3 1
9 7
8 5 9
9 3 2
8
5 1 4 3 8 9
3 8 4 7
6 2 1
Hard #4
8 1 4
9 6 5
3 7
5 3 6
2 7 1
7 6 4 9
1 4 5
9 2 6 1 8
8 4 9
Hard #5
4 8 5
3 6
9 6 5 8 4
7 3
3 2 7
8 6 1 4
5 2 9
6 5 1
7 4 6 8
Hard #6
3 1
9 1 3 4 5
4 3
6 9 5
7 4
5 2 7 3
6 8 9
4 5 1 6 8
6 2 4
Hard #7
4 7 9 1
5
9 1 3 8
9 8 3
6 9 7
2 5 8 6
6 5
5 1 9
9 8 3 7 4
Hard #8
7 6 2 5 9
1 2 7
3 4 1 2
2 1
4 7
5 9 1 6
7 2 6
9 3 7 8 6
8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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