Printable Hard Sudoku

Set gj2x7o. 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
5 4 7 9 8
6 7
5 1 4
2 7 8 9
1 6 5
6 4 8
7 1 2 4
8 3 1 2
Hard #2
4 1 8
5 2 6
2 3 8 7 9
2 4 7
7 2
4 1 6
8 7 4
5 9 6 7 3
3 6
Hard #3
1 4 3 6
3 1 8 9
6 7 2 9 1
3 1
7 4 9 8
1
2 5 6 7 3
2
4 5 6
Hard #4
3 6 8
5 9 6 4 3
8
2 5
1
2 9 4 6 7
3 7 5 9 1
3 4 5 6
4 1 3
Hard #5
7 1 3
2 1 5 6
5 2
3 5 7 6
7 8 6
1
6 9 1 2
2 4 5
6 5 7 8 3
Hard #6
5 6
2 7 8 9 5
9 7 6 4 8
5 4 1 8
1 2 6 3
6 2 9
4 2
7 4
1 9
Hard #7
6 5 7
1 7 3 8 5
2
8 4 3
2 5 9
4 9 1
9 7 1
5 6 8 9 2 3
8 6
Hard #8
4 1 2
9 5 1
9 6 5
3 4 6
7 8 9
8 6 3 1
5 1
2 8 9
2 4 3 5 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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