Printable Hard Sudoku

Set n47szl. 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 6
6 4 5 9 3
5 8 4
7 1 4 3
2 9
7 9
3 4 8
8 5 7
6 8 4 2 9
Hard #2
5 8 2 1
8 2 4 9
4 6 9
5 6
9 8 2
2 9 6 3
5 3 7
2 1 5
6 8 1
Hard #3
5
2 1 6 5
4 1 8
6 3 8 9 4 5
3 9
7 8
8 6 3
3 5 9 1 4
4 5 8
Hard #4
6 3 7 8
8 9 2 4
1 4
5 8 7
3 5 9
7 8 2 6
8 2 6
3 6 2
5 1 9
Hard #5
4 3
2 8
6 2 3 1
5 2 8 1 6
7 4 5 3
5
9 1 8 5 7
3 2 9
6 1 2
Hard #6
7 2
5 2 4 3
5 3 4 6 9
9
4 8 1
7 4 8
4 3 6 2 7
1 3 2
6 2 3
Hard #7
2 1 3 9 8
1 3
7 5 6 1
8 7 1 6
5 9
2 8 3 5
8 1 2 7
4
5 7 8
Hard #8
2 9
5 8 7
8 1 2 5 9 6
9 6 7
5 3 6 7
7 2 8
9 6 1 2
2
1 3 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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