Printable Hard Sudoku

Set 403e8b. 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
2 3 9
3 7 8
5 4
4 9 2
9 6 4
3 2 1 6
5 6 1 2 3
7 8
3 7 6 5
Hard #2
5 9 7 6 1
2 1
4 8 9
4 2 3 8
1 9 4 7 3
5
4 2
4 5 9
5 8 3 4
Hard #3
2 1 9
1 8 6 2
1 8
1 5 6 3 2
3 6
4 1
7 2 6 1
9 1 7
8 5 6 9
Hard #4
8 6 1
5 6
9 1 7 4 2 5
9
1 8 3 2
6 3 4 8
5 6
9 5 3 7
6 9 1
Hard #5
6 8
2 9
1 6 8
9 6 2 4
1 6 8 3 5
7 9 1 8 3
4 9
9 7
2 3 6 9
Hard #6
4 6
8 5 3 6 4
7 1
3 2 9
8 3
4 9 7
1 6 3 2
9 7 2
5 9 6 8 4
Hard #7
9 8 3 7
4 2
3 4
3 2 1 7
6
4 9 2 1
5 1 3 7 9
4 1 5
2 3 6 4
Hard #8
8 3 2 5 1
8 7
6 5 1 9
9 2 4
2 1 4 7
3 7 8
3
4 7 9 6 5
7 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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