Printable Hard Sudoku

Set 1xt9mca. 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
8 4 2 3
6
9 3 7 5 8
5 1 3
1 7 8 2
7 4
4 1 6 9
3 9
7 2 6 1
Hard #2
9 3
4 2 9 5
3 6 2 1
7 3 6 2
3
2 9 5
8 3 6 1
1 9 7 8
6 1 4
Hard #3
9 8 2
7 6 8 9
6 4 3
6 8 1
7 3 4 9 5
2 1
8 6 2 5
2 5 9 3
5
Hard #4
8 6 2 9 1
7 5 8
6 8 3 7 2
4 3 2
1
4 8 9
9 1
4 5
6 5 7 3 9
Hard #5
8 5
7 3
9 7 2 4
7 8
6 3 1
1 4 6 9 2
6 1 8 4
3 5 7 9
4 6 7
Hard #6
1 2 4 6
3 9 1 5
2 9 5
8 6 7 1
1 8 4
9 5 6 3 2
8 3 5 6
1 9
Hard #7
8 1
9 3
2 8 6 9
7 8 3 1
4 6 2 5
2 5 6 7
6 7 4 8
1 9 6
8 3
Hard #8
7 6 4 2 9
8 5
9 1
1 9
5 7
8 3 5 6 4
2 9 6 8
4 8 7 2 1
3 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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