Printable Hard Sudoku

Set 1oe4a66. 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
9 8 5
9 1 4
8 2 1 4 3 6
9 4 6 3 2 8
1 9 6
8
4 3 5
7
3 1 4
Hard #2
9 2 7 6
8
2 8 4
5 3 1 7 8
2 6 4 5
2
1 4 5 2 3
5 9 8
3 7 2
Hard #3
7 1 9 8 5
6 7 4 8 3
3 5 4
2
1 6 8 3
7 4 9
9 3
1 2 6 7
8 5
Hard #4
3 8 1 6 5
2
9 8 2
9 3 1 7
4 8
3 5 2
7 5 4
2 7 9 5
8 1 3 6
Hard #5
8 3 7 9 4
9 4 7 6 3
5
7 2 1
8 9 6
1
1 8 7 9 5
5 4 6
6 5 1
Hard #6
6 3 4 1
8 1 6 5 3
8
7 5 9
7 1 2 4
5 8
4 2
6 2 9 4 7
7 5 1
Hard #7
9 3 4 6 7
5 2
4 5 3
7 8 1
5 4 1 2 9
3
9 8 1 7 3 5
5
9 4 6
Hard #8
3 9
8 2 5
5 9 1
3
3 7 1
6 4 2 7 5
4 8 9
4 5 6 7 1
7 3 6 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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