Printable Hard Sudoku

Set 1mh08ag. 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 6 2 4
2 1
5 9 7
8 3 9 4 1 7
9 3
1 9
1 5 8
4 1 8 2
2 3 9
Hard #2
7 4
8 2 9 7 1
6 5 9
8 7
5 7 6
6 9 4 3
6 5 9
4 8 3 1
9 8 3
Hard #3
5 8 3 1
9 1 4
4 8 6 3 5
8 2
5 9 7 8
7 1
9 2 8
2 9 1
1 3 5
Hard #4
2 9 4
9 8 7 2
4 6
9 4 6 5 1
1 7 4 8
3 1
3
6 8 3 9
7 2 8 1
Hard #5
6 7 8
5 3 2
3 6 1
5 8 1 9 6
7 8
3 4 9 5
4 7 6
8 2 4
8 2 9
Hard #6
7 9 5
3 5 7 8
8 5 9
9 5 6
1 3
8 2
1 8 6 9
2 4 9 5 3
2 7 1
Hard #7
3 5 9 8 7
4 1
5 4
2 5 3 9 6
3 1
9 7 5 4
4 9 7 3
9 8
7 5 6
Hard #8
8 5 4
4 6 8
1 2 9
3 4
2 9 1
5 3 2 9 7
3 4 6 8
5
7 9 2 5 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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