Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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