Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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