Printable Hard Sudoku

Set 1fcljo9. 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
1 3
3 9
4 3 7
7 8 1 3 5 2 6
2 6 9 7
4 5 2
9 5 2 3
6 9
1 4
Hard #2
5 6 3
9 6
6 3 5 4
1
3 8 4 1 5
8 4 9 6
5 3 6 9
2 8 7
6 8 3
Hard #3
8 4 2
7 6
3 6 7
9 1 2 3
5 7 9
6 2 5
7 6 3
1 3 9 7 4 2
4 8
Hard #4
1 2 3 8
4 3 6
4 5
4 6 2
3 8
2 8 5 4 9
1 5 7
2 9 7
6 7 1 2
Hard #5
9
6 3 9 5
2 4 6 8 3
5 7
1
7 3 4 9
8 6 3 1 4
9 5 1 6 8
7 9
Hard #6
4 3 6
3 2 9 5
6 1 7 9
1 3 5 4 6
5 8 1 9
5 1 4
7 5
9 8 2 1
Hard #7
9 2
1 5 3 7
6 4
1 5 3 9 4
2 5
3 9 1 8 2
9 6 1
4 2
3 5 6 9
Hard #8
9 3 6 5
1 8
8 2
5 9 4
3 9
4 8 7 9 6 1
5 6 4
4 7 2
8 7 5 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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