Printable Hard Sudoku

Set 1b08z7x. 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
5 9 4 7
4 7 3
5
6 3 1 9 8
9 4 2 3
3 2
6 3 5 7 8
1 5
8 7 6
Hard #2
6 1 3 5
2 3 8
2 8 3
9 4 6 2
9 5 7
3 6 8
8
5 9 7 6
2 6 1 8
Hard #3
4 3
7 9 8 6
2 8 6 1
5 3
7
9 4 3 1
4 8
7 3 5 2 1
4 6 1 5 7
Hard #4
4 2
1 8 3 4
9 6 2 5
8 7 4
5 7 4
9 8 6
5 1 9
9 4 6 7 1
6 1
Hard #5
2 5 8 7
7 8 9
7 3 6 4 2 1
5 1
9 8 3
4 6
8
6 4 9
2 7 3 5 9
Hard #6
5 1 4 9
7 4 5
6 3 2
9 4 3 8
6 1 7
2 4
6 8 5 9 1
9 8 6
2 8
Hard #7
3 1 8
5 1 6 4
8 5 7
9 3
7 4 8
4 6 3 5 1
6 5
8 9 7 1
2 9 6
Hard #8
9 4
5 8 6 3 4
6 1 3 8
1 3 9
3 2 8 6
5
6 5 7 8
4 8 9 3
2 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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