Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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