Printable Hard Sudoku

Set 57y283. 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
7 5 1 2
1 8 9
3 6
8 9
8 6 7 3 1 9
5 7 8
9 2 5 6
1 6 9 5 4
Hard #2
6 5 9
2 7 6
4 8 3 5
5
7 9 2 8 3
5 3 4 9 6
1
1 5 7
2 1 3 8
Hard #3
9 4 7 8 3
8 6 3
7
9 6 4
2 3 8 4 1 5
8 7 3
7
6 5 1 9
2 1 7
Hard #4
5 4 6 7
2 4
9 6 2 1
1 3 2
2
3 5 8 6
7 1 5 8
5 1 8 2 9
7 5
Hard #5
1 6 8
2 7
7 1 5 6 3
9 5 8
2 1 9 4 6 5
6
7 2
7 9 4 5
5 3 8
Hard #6
1 6 5 3
3 2
7 9 6
9 7
5 1 2
4 1 8
4 2
3 1 7 9 6
8 2 1 6 7
Hard #7
8
6 5 1 4
9 6 1
3 9 7 4 5 8
4
5 8 2 9 4
7 2 3
1 5 9
3 9 1
Hard #8
9 6 5 1 7
7 4 6
3 2
9 8 3 1
3 5 8
5 3 6
4 1 9 7 2
7 4 1
4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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