Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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