Printable Hard Sudoku

Set su7kz. 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
8 5
2 6 3
5
3 8 9 2
2 5 4 8 3 9
9 4 2
6 9 1
5 2 6
4 9 5 1
Hard #2
7 5 2 6
9 2 7
2 8 4
9 3 6 4
1 7 6
1 7 9
4 7 9
2 9 1 5
1 8
Hard #3
1 8 4 3
7 9 1 4
3 5 2
5 6 3 7
5 9
2 4 7 6
9
8 9 4
6 9 8 1
Hard #4
2 1 7
1 7
5 4 3 2
2 4 9 3
9 2 6
8 3
4 9 8 6 3 5
1 6 4 2
9
Hard #5
2 3 9
3 7 8
5 4
4 9 2
9 6 4
3 2 1 6
5 6 1 2 3
7 8
3 7 6 5
Hard #6
5 9 7 6 1
2 1
4 8 9
4 2 3 8
1 9 4 7 3
5
4 2
4 5 9
5 8 3 4
Hard #7
2 1 9
1 8 6 2
1 8
1 5 6 3 2
3 6
4 1
7 2 6 1
9 1 7
8 5 6 9
Hard #8
8 6 1
5 6
9 1 7 4 2 5
9
1 8 3 2
6 3 4 8
5 6
9 5 3 7
6 9 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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