Printable Hard Sudoku

Set zula0r. 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
5 1
8 4 5 7
9 2
8 6 7 3
1 6 5
7 9 1 5 4 8
5 8
6 5 2
2 3 1
Hard #2
2 4
6 4 2 5
5 7 8 6
8 4 7
9 6 3 4
2 6
9 5
6 9 5 4 1 8
7 3
Hard #3
6 8 5 7
3 6 8
4 8 1
1 5 7 4
4 1 2 9
4 3 8
2
2 9 7
1 3 8 9
Hard #4
6 5
4 9 1 7
5 7 1 9 4
8
4 3 2 6 9
7 2 8
2 1 9 5 6
1 8
3 2
Hard #5
2 8 5
9 2 1
5 3 6
9 7 2
6 1 2
2 3 8 4 7
3 7 1 4 6 5
8
4 7
Hard #6
4 6 3 2 8
3 4
7 5 8 1
9 2 8 6
1 2 3
7 1 9
1 2
4 6 1 7
2 5
Hard #7
5 3
6 7
8 4 7 9
3 1 4
2 6 4
6 9 2 1
1 9 8 2 3
2 9 8
7 5 2
Hard #8
8 5 6
2 7 4 3 9 8
4 9 2
1 3 7
6 4 2 3
6 2 9
3 8 6 5
9
6 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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