Printable Hard Sudoku

Set 1c3p51z. 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 5 8
8 9 6 2
9 4 8 1
7 4 9 3
6 9
1
5 7 1
2 3 4 7
7 6 5
Hard #2
7 3
3 8 1
1 7
2 8 5 3 9
2 1 4
3 1 4 5 6
3 5 8 6
4 1 5
6 4
Hard #3
8 7 1 2
3 1 5 4
9 6 3 1
3 4 7
8 4 9
7 5 8
2
2 7
5 8 6 1 2
Hard #4
3
6 9 1
9 1 6
2 1 8 9
3 9 2 8
7 5 9 2 4
5 4 1 3 8
1 2
5 3
Hard #5
1 3
3 2
3 8 2 5
3 2 9 4 8
4 1 5
9 7 3
6 9 7
1 2 6
8 5 3 4
Hard #6
3 5 4 1 6
4 1 6 9
5 6 7 2
5 4 3
4 9
3 9 2 8 1
3 2
7 1 6 5
Hard #7
9 5
8 3 1 7
6 9 4 1
9 4 6
1 6 9
8 2
9 5 1 7 8
6 7 5 4
4 2
Hard #8
2 6 4 8 9
5
9 3 2
1 8 4 9 7
9 2 1 7 3
4 1
9 7 3 1
4
8 7 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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