Printable Hard Sudoku

Set 981asl. 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 2 3
8 4 2 6
7 6 1
8 5 1 4
5 4 9
9 3 6
2 4 6 7
9 5 2
9 6
Hard #2
6 3 9 8
8 9 7 3 4
1 4 5
1 5 3
9 2 4 1
7 3 9 5
9 4 7
2 1 6
Hard #3
9 5
1 8 2 9
3 8 4
6 7
7 6 5 1 3
9 4 6 2
5 7 1
5
1 8 9 6 5
Hard #4
4 5 7 1 8
9
6 4
8 3 1 4
5 8 1
6 7 2 8
7 9 2 3
3 5 4 9
2 3
Hard #5
3 6
7 3
4 1 6 7 2
6 2 8
5 8 6 1
9 6 7
8 9 1
5 8
4 2 6 9 3
Hard #6
8 7 2
2 5 9 8 3
1 2
4 8
1 2
1 2 5 3
3 4 6
6 8 7
7 4 5 2 9
Hard #7
6 7 2 3 5
3 6 5 4 7
2 8 6
3 9 8 1
6 4
4 5 2
5 3
6 1 8
8 7
Hard #8
8 2 5
1 3 6 4
9 4
4 2 6
1 2
3 2 9 4 1
6 9 5 4 1
5 7
7 4 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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