Printable Hard Sudoku

Set 1pb8f59. 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
1 5
6 4
8 9 2 6 7
1 8 4 3
4 1 3 7
7 9 1
8 6
3 9 4 1 8
9 5
Hard #2
2 5
3 5 7 4 1
6 1 7 2
2 3 5 8 6
1 6 2
8
1 7 9 3 5
9 4 7
9
Hard #3
6 1 7 3
9 7
6 1 5 9
4 2
1 8 9
5 2 9
1 6 5 4
1 8 3 6 2
7 8
Hard #4
9 8 2 1
1 2 3 9
6 5 4
7 8 4 1
9
9 2 5 8 1
7 3 9
6 8
9 4 6
Hard #5
4 9 3 6 5
8
1 2 9 4 8 7
3 2 5 6
8 9 4 2
7 9
4 9 2
9 7
2 5
Hard #6
7 1
7 3 5
5 4 8 1
2 9 3
6 5 9
8 1 6
9 1 4
5 3 7 6
4 2 6 9
Hard #7
6
9 2 7 5
5
2 8 4 6 3 5 7
3 7 1
1 8
4 2 3
1 3
9 6 8 4 7 1
Hard #8
5 8 6 4
4 3 7 8
2 7 3
3 9 4
2
6 4 3 9
6 2 8
9 8 5 4 3
1 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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