Printable Hard Sudoku

Set 1nx40ba. 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 8 5 1 6 2 3
9
9 1 3
6 3 5 4
7 2 1 5
5 9
2 7 4
1 2 7 6 4
Hard #2
3 9 8
2 5 7 1
8 2
6 5 9 3
2 5 7
7 1 6 9
9 5 8
8 9 6 7
1 7
Hard #3
1 8 5
4 8 7 1 3
5 7 6 8
3 9 1 2
7 9
6 8 1
2 5 4
3
3 9 1 7
Hard #4
2 9 3 6 8
6 5
8 5 3
9 7 3 4 8
3 7 6
5 9
7 2 5 8
4 6 3
2 1
Hard #5
9 3 1
3 6 5 4 2
4 7 3 2
8 2 1 4 6
9
7 5 8 9
4 8 9
9 3
2 7
Hard #6
1 7 8
9 2 1
8 3 4 2
1
4 2 5 6
9 8 6 7 4
5 6 3 7
5 1 9
3 8
Hard #7
1 8 3 4
3 5 6
1
5 2 4 8
2 6
3 6 9 5
7 5 8 4 3
1 6 3
7 9 2
Hard #8
6 8
2 4 5
1 2 7 5
4 3 5
9 5 1
6 1 2 4
6 1 8 4 7
3 7 9
9 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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