Printable Hard Sudoku

Set 1ctica7. 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
2 4
5 4 7
9 3 6 2
8 1
9 7 3 6
6 8 1
3 5 1 9
4 6 7 8
5 1 7
Hard #2
1 5 9
2 1 7
9 5 8 4 2
6 3
7 1 4 6 9
1 7
4 8 5 3 2 1
9 8 4
Hard #3
3 5 9 4 8
4 9 3
4 9
8 6
7 5 8
6 4 2 1 3
9 1 2
7 5 6
8 7 4
Hard #4
9 4 1
1 5 2
5 3 7
5 4 9
8 6 1
1 6 9 2 7
9 8
8 2 6 1
7 2 6
Hard #5
6 8 9 1 5 7
1
4 5 6 2
3 5 7 1 4
2 4 7 3
1 9 6
1
5 6 7 8 4
Hard #6
8 2 5 6 7
3 7 6 5 8
8 3
5 6 9 1
8
3 1 2
6 5
9 5 7 2 4
3 9
Hard #7
3 8 6
9 4 7 5
2 1 8
8 2 4
2 5 1
4 1 3 5 2
7 2 3
6 7
6 9 7
Hard #8
1 2 7 4 9
7 8 5 4
8 2
8 6 9 3
3 6 9 5
3 7 6
6 3 9 7
1 7
5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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