Printable Hard Sudoku

Set 1b7ee9k. 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 4 2 7
2 4 1 8 6
9 3
4 3 2
7 8 2 9
8 2 6
6 9 7
5
1 2 4 6
Hard #2
5 9 2
8 1 7 3
5
6 7 2 4 1
4 2
3 5 1
4 6 7 9
8 1
2 9 3 4 5
Hard #3
4 1 9
9 1 7 3 5
5 6 1
9 8 2
1 3
2 6 4 1
6 1 9 8
3 7 6
9 5
Hard #4
3
1 2
9 6 8 5
1 7 9 3 2 4
7 1 2 6
4 5
5 9 8
8 4 1 9
2 6 5
Hard #5
9 8 3
2 3 6
8 5 9
8 2 9 1
5 3 2
3 9 4
5 1 2 6
9 1 4 7
4 3
Hard #6
2 7 1
2 5
9 4 3
6
8 6 7 9 1
9 5 4 8
6 7 8
5 8 1 7 2 6
1 4
Hard #7
2 6 1
3 9 8 5
1 2 3 7
8 3 4 9
5 9 1 7 6
7 8
7
4 2
1 4 6 3
Hard #8
2 7 1
6 8 3
3 7 5
5 6 3
5 7 4
8 5 9 2
9 5 1
2
2 7 3 4 9 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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