Printable Hard Sudoku

Set im3o6b. 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
4 7 1 6
6
3 5 6 7 1
8 5
5 1 4
7 9 4 3 5
8 5 6
4 6 7
8 4 2
Hard #2
4 8
5 7 6 4
1 6 7 9
9 5 8
8 3 4 6 9
9 6 3
8 4 5 3
9 5 4 6
1 6
Hard #3
2 3 1
9 1 4
5 8 2
4 2 6
6 4
1 7 5
2 3 9 8
8 5
6 4 8 7 2 9
Hard #4
9 4 7
3 6 8
1 2 6
9 1 8 3
4 6 3 9
3
6
6 4 7 2
3 9 2 1 5 4
Hard #5
9 6 2 8
4 1
6 8 3 5
2 7 5 9
6 4 9 3
1 7
2 9 6
6
2 9 1 5 4
Hard #6
8 7 2
1 3
9 1 3 5
8 2 3
4 8 5 2
2 6 7 9 4
6 3 5
7 5 1 2 3
Hard #7
4 2 3 5 8 9
3
1 7 4 8 9
8
2 5 9 6 3
4 1
3 5
6 8 7
3 1 5 4
Hard #8
2 9 4
4 8
8 5 1 7 3
1 6 2 9 5
7 1 8
8 7 4 2
2 7
6 9 4
1 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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