Printable Hard Sudoku

Set 1yru56t. 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 5 6 7 8
2 9 1
3 2
7 3 8 5
9 1 7 5
8 9 7
1 2
6 3 1
7 5 3
Hard #2
6 1
8 2
7 5 4 6
9 5
5 3 1 6 8
4 3 7 1 2
9 6 8
3
8 5 7 9 6
Hard #3
4 8
3 2
5 6 3 7
9 4 2 3
3 9 2 1 4
8 7 3
4 9 7 3
8 1 2 4 5
Hard #4
5 3 8
4 6 2 1
8 1
7 4 8 6
4 1 2 9 7
6
5 3 1
8 6 3 7 5
1 9
Hard #5
5 4 3
7 6
2 3 7 9
8 3 7
7 5 1
5 1 6 8
4 6 2
2 9 6 3
5 3 8
Hard #6
7 8
6 8 5 4 1
7 6 3
3 2 1
4 1 8
2 3 9 6
1 8 5 2
4 1 8
6 2
Hard #7
5 9
7 6 9 3 4
4 3 7 6
4 7 6
9 1 2 3 6
9 8
7 6 1
9 2 3
2 4
Hard #8
2 3 1
5 7 2
9 6
1 9
8 2 9 7
6 7 8 5 3
6 8
7 9 6 1 2
3 2 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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