Printable Hard Sudoku

Set 1h2mxxe. 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
7 2
9 6 5
5 1 2 8 7
1 5 4 3 2
8 4 2 1
9
2 6 5
8 9
4 1 7 3
Hard #2
2 8 9 7
9 3
7 6 2 8
4 9
3 5
2 4 1 5
8 1
3 5 9 4
1 9 7 2 5
Hard #3
2 6 4 5 7
3
9 1 8
1 7 2 5
4 9 3 7
4 6
8 5 9
1 9 8
5 1 7 4
Hard #4
1 6 3
9
2 4 5 8 7
3 7 4
9 2
1 8 2 4 3
4 7 1 3 5
9 1
5 8 6
Hard #5
3 7 8 6 4 1
1
7 8 3
7 4 1 5 9
5 3 6
6 8 1 4
9 6 2
5 9
8 7
Hard #6
2 7 3 4
6 5 9
5 1 9
2
6 7 8
8 7 1 4 6 5
8 9 6
8 3 5
2 3 6
Hard #7
9 2 8 5
6 2 1
3 7
9 1 7 4 3 5
5 7 8
6 9
2 4 5 7 6
3 2
7 8
Hard #8
1 5
7 5 8
6 9
3 7 1 9 4
7 4 6 2
6 9 3 2
5 7
4 3
8 1 6 3 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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