Printable Hard Sudoku

Set 17mxqon. 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 2 8
1 7 8
9 5
5 2 6
7 5 4 1
4 6 8
1 2
2 3 5 1
7 1 6 5 3
Hard #2
7 9 3
4 9 8 6
2
2 4 5 3
1 6 3
4 5 2
1 2 5 4
3 9 7 2
4 3 7
Hard #3
6 4
2 4 1 6 5
8 3 1 9 2
7 4 3 6
5
6 1 9 2
5 4 2 8
3 5 7 6
Hard #4
4 6 7 8
9 6 2
3
5 4
5 2 7 9
1 5
7 6 4
2 5 8 3 6
8 6 5 9 7
Hard #5
7 1 4 9
2 6 3
5 6 9 8
7 8 1
4
7 2 3
5 8 1 3 2
2
4 6 9 2 1
Hard #6
7 1 2
4 3 7 2 9
2
8 7 6 2
2 3 1
9 3 5 4
4 8 6 7
6 9 2
3 4
Hard #7
5 9
7 1 2 8
6 9 4 8 2
2 9
6 1
2 6 1 5
7 8 9
2 3 8
6 1 4 3
Hard #8
9 1 7
1 6 7 2
5 9 3
8
2 4 1
5 7 8 3 4 1
2 3 8
1 9 4 7
6 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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