Printable Hard Sudoku

Set 1q5lpdr. 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 7 2 9
2 1 6
6 5 3
1 9 7
5 2 8 1
3 7 5
8 2 6
4 2
1 5 3 2
Hard #2
6 5 3
7 2 6 4
8 5 6
1
4 3 7 1
7 8 6 3
9 8 2 5
4 7
2 6 9 4
Hard #3
3 6
1 6 2
5 2 9
7 6 3 8 5
2 9 5 1 4
8 3 6
4 2
4 1
9 7 4 1
Hard #4
5 9 4
2 8 4 1
9
7 5 4
6 3 8 9
4 2 6 1
7 1 3
1 3 7
6 8 4 9
Hard #5
4 1 6
3 7 9
2 3
7 5 4 9 2
8 1 5 4
6 4
3 8
7 6 3 9
6 2 1 7
Hard #6
6 1 4
7 3 1
4 9 7 5
6 3 9 1
8
2 3 4 6 8 9
1 3
3 9
8 5 9 7
Hard #7
9 6 7
2
5 9 6 3 8
2 3 8 7
4 1 5 2
3 8
5 6 3
9 3 6
7 4 2 1
Hard #8
9 6 4
5 2 6 8
1
8 2
1 7
9 4 3 5
2 3 6 9 8 1
4 7
7 9 4 5 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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