Printable Hard Sudoku

Set 1el9tgz. 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
3 8 4
7 9 8
4 5 2 8
9 5
1 5 6 8 3 4
7 9 3
6 3 4 7
8 3 5 2
Hard #2
7 5 3 1
2 6 3
6 5 7 1
1 7
9 1 2 6 3
7 1
7 8 1 4
3 9 5
5 6
Hard #3
9 5 6 1
5 7 8
2 1
4 6 2 7
9 4 1
8 3 4
7 1 3
6 4 9 8
3 8 2
Hard #4
2 6
5 4 9 2
1 9 2 3 7 8
3 7 8 1 9
2 3
1
3 6 5
7 8 9
3 2 1
Hard #5
5 3 7
8 7 1
6 5 2
1 3 4
3 4 6
5 9
2 4 1 5
1 3 6
4 2 1 7 3
Hard #6
6
5 9 7
1 4 6 2
4 9
6 7 5 4 1
2 1 5 4 6
1 4 7 8
7 4 2 9
3
Hard #7
2 5 4 6 1
3 2 9 4
8 6
2 1 8 4 9
9 3
5 6 3 8
4
8 3
7 6 2 8
Hard #8
8 6 7
5 8 4 6
1 9 8
6 9 7 8
7 2
3 8 1 4 5
2 1 7 3
4 9 5
3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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