Printable Hard Sudoku

Set 1dptm2x. 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 3 6
3 5 9 7
9 8
8 1 6
5
2 7 3
7 3 4 8
2 4 1 3 6 7
5 9
Hard #2
3 1
6 5 9 2
9 3 8 6 4
2 4 8
5 8 4 1
6 2
8 5 7
3 6 8 4
7 9
Hard #3
1 2 4
5 8 1 7
7 9 3 1 8
5 6 3
4
8 5 9
3 1 2
8 6 4
7 4 1 2
Hard #4
8 3 6 2
5 1
1 6 7 9
9 8 2
5 2 6
3 1 7
7 6
8 2 3
3 6 8 4 9
Hard #5
5 1 4 2
9
3 4 1 8
5 4 6 3 9
9 1 2
2 7 5
6 7 2 5 3
3 2 4
1
Hard #6
6 9 2
1 6 7 8
2 8 6 9
2 9 4
7 6 3 5
9 6 5 1
1 4
7 3 2
5 9
Hard #7
9 1 7 3
2 7
8 9 4 5
2 5 7 3
7 8 1
6 2
2 3 8
4 1 6 2
6 5 3
Hard #8
1 8 9 4 5
7 3 2 1
1
9 4 3
3
2 4 8
4 1 7 9 2
7 3 2 6 4
1 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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