Printable Hard Sudoku

Set j2bx67. 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 7
4 1 6
9 5
4 6 9 5
1 5 4 9
7 8
2 7 3 4 9
8 5 4 1
9 6 3
Hard #2
6 4 5
4 5 2
8 1 6
2 5 9
9 1 7
4 3 7 6
7 8 9
7 3 9
9 2 3 8
Hard #3
5
4 2 3 8
1 5 9 7 2
8 7 4
1 4 6
6 2 5 9
4 8 7 5
3 5 7
6 9
Hard #4
6 9 3 1 5
2 5
9 4 2 7
3 5 4
8 2 3
1 2 9 6 8
7 9 4
8 4
9 6
Hard #5
4 5 8 7
2 1 3
7 2
1 2 9 3
2 7 1 6
6 4 5 1
7 4 3
3 4 6 7
2
Hard #6
4 2 9 5
9 1 7
6 9 5 7
7 4 8
5 1 3
1 6 2
4 3 7 8
2 8 7 4 1
Hard #7
2 8 1
6 9
3 8 4
1 7 4 5 6
6 8 1
8 9 5 3
6 5 4 8 9
9 1
7 3
Hard #8
3 2
7 5 2
2 6 1 5
7
8 9 2 4 6
3 9 5
4 6 8 1 9 3
8 1 6
6 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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