Printable Hard Sudoku

Set 1f72te. 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
4 2 1 3
7 9 2 4
1
9 3 5
8 6 2
2 1 9
8 4 5 3 6 7
1
6 5 7 4
Hard #2
4 1
3 6 9 8
6 2 4
6 1 5 3
5
4 8 7
7 4 8 3
8 2 5 6 9 4
3 9
Hard #3
8 9 4 3
9 2
4 7 1
9 2 4
3 1 2 9
3 8
3 4 1 5 2
9 8 6
5 7 9
Hard #4
4 7 5
8 1
9 5 8
7 1 9
4 8 5 9
5 3 6 1 4
6 7 2 4 3
9
1 4 5
Hard #5
9 6 5
8
6 9 5 2
4 1 3 9
2 5 6
1 7
4 2 3 5
7 8 6 3 4
8 1 4
Hard #6
8 3 6
7 4
6 9 4 2 1
8 9 3
5 4 3 6 2
6 5 9
2 5 7 9
7 1 2 9
Hard #7
9 4 7 5 6
5 8
8 6
2 7 1
8 7
4 9 6 8 2
3 2 8 9 1 4
1
2 9 7
Hard #8
7 6
7 4 9
1 9 8 4 2
2 3 7 1
8 2 9
4 9 3
2 8 7 1
4 1 5 3 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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