Printable Hard Sudoku

Set 5t3a4a. 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
9 8 1 7 5 6
3 9 1 4 8
8 9 6 3 1
4 7 5
2
5 1 3
9 7 8
8 5 3
Hard #2
9 6 5
9 6 2
5 3 2 1 8
3 8 6
5 6 7 8
2 3
8 2 1 5 7
8 4 1
7
Hard #3
7 8 4 1
9 8 4
3 4 1 7
5 4 3
2 3 7
6 3 7
3 2 5 6
6 5 2
1 9
Hard #4
3 7
6 4
3 8 5
3 8 1 4 6
1 5 9 4
2 3 1
8 1
7 9
5 6 7 1 4 9
Hard #5
6 2
1 9 5 7
3 4 2 6 9
9 8 1 2 4
7 9
6 3
5 2 6 4
5 7 8
3 9
Hard #6
1 8 3 4 6 2
7 8
4 1
9 8 7 2
8 3 6
9 3 7 4
2 8
4 9
6 9 8 5
Hard #7
5 7 2 3 9
2 7 1
4 9 1
2 4 9
6 4
4 1
8 2
2 5 4 7
5 7 9 6 8
Hard #8
9 2 3
3 4 9 6
8 3 5
3 5 4 2
1 2 7 6
6 1 3
6 9 8
1 8 5 4
9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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