Printable Hard Sudoku

Set fiwn4z. 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
3 7 8 5
8 7 2 6
2 4 3
5 7 1 4
2 1 9
1 4 3
9 2 6
6 3
4 5 7
Hard #2
1 9
4
5 8 3 1
9 1 8 5 4
3
2 4 6
5 4
1 3 8 7
7 6 2 9 4 5 1
Hard #3
7 5 8 9
6 8 7 5
7 9 4 1
2 9 4 6
8 1 5 6 3
5 2
3 7 6
4
2 3
Hard #4
8 6 9 2
2 4
5 1 7 8 9 3
3 6
9 6 7 8
5 7 4
4 9
1 2 4
7 2 8
Hard #5
3 8 4
9 5 4 6 1
7 9
8 6 3 5 2
5 3 8
1 4 7 5
4 8 7
6 1 8 9
Hard #6
5 2 4 7 6
8 2
7 9 5
6 2 8
4 8 3 6 2
6 1
8 6 7
3 4 2
2 5 8
Hard #7
1 4
7 3 2 8
3 9 1 2
5 2
4 8 7 5
2 6 1 8 7 3
1 6 9
6 4
8 7
Hard #8
4 2 1 8
5
4 6 7
9 8 1
8 4 1 7
3 1 9 5
3 8 7 9
7
7 9 1 4 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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