Printable Hard Sudoku

Set 1eun80t. 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
5 3 7
1 7 4 5 2
8 2 3 9
1 5
3 9 6
6 2 4
8 1
7 2 6
6 8 5 3
Hard #2
7 4 5
5 6 7 1 4
9 4 5 8 7
8 5 1
1 7 3
2
1 9 2 3
4 6
3 2 5
Hard #3
1 4
8 1 6 4 5 9
9 8 3 1
8 2
7 2 8 9 1
5 1 2
4 7
6
7 9 2 1
Hard #4
1 8 9 7
9 2 1 8
2 5 1
9 5 3
8 3
6 4
7 5 1
8 4 2 7
6 2 7 3
Hard #5
4 1
5 2 4 8 7 1
9 7 2
7 8 9 5 3
5 3 7
6 5 4
3 9
6 5
6 4 3
Hard #6
4 1 6
1 6
6 4 8
5 8
2 6 4
3 8 7 4 9
3 5 2
4 9 2 6
1 9 6 7
Hard #7
3 9 5 4 8
8 5 6 7
4 1 7 3
1 4 8
7 3
2 9
9 1
7 2
7 2 6 4 3
Hard #8
1 8 6 2 9
6 3 1 4 7
5 9 1 3
9 7
4 9 2 1
3 6
2 4
7 5 4
7 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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