Printable Hard Sudoku

Set 15x953b. 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
7 9
2 8 6
5 1 3 9
6 9 7 2 1
3 1 6 4
5 4 8
9 4 2 8
3
2 9 6
Hard #2
1 2 9
8 6 4
9 3 7 2
9 4
1
4 5 2 7 1
3 5 6 4
7 3 5
4 1 3 9
Hard #3
9 6 4 8
4 1 8 5
7 9
5 9
1 4 2
4 3 1 5
7 2 5 6 1
4
1 2 9 7
Hard #4
6
3 6 9 1 7
4 2 5 8
8 6 7 4 1
1 3 5
3
5 9 4 2
3 8 5 9
9 1
Hard #5
7 8 9 1
7 4
4
6 1 2 8 5
9 8 1 2
3 2 6 4
1 3
2 6 7
8 3 1 5
Hard #6
8 4 1 6
5 8 7 2 1
4
6 5 4
9 2 5 1 3
5
2 7 6 3
6 2 5
2 6 7
Hard #7
6 4 9 2
3 5
4 6 5 1
2 1 6 5 4
5 9
8 4 7 5
2 1 3 6
6 7 3
7
Hard #8
7 2 8 1
1 4 7 6
5
3
5 9 2 1
6 5 4 2
8 2 1 3
6 1 8 4
5 3 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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