Printable Hard Sudoku

Set 3blxx2. 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
9 7 6 4 5 8
1 3 5
2 7
9 3 8
8 6 5 3 2
8 5
6 8 1
5 9 2 1 7
Hard #2
9
1 6
7 3 4 8 9
2 4 8 1 5
3 7 8
7 5 2
7 9 4
3 9 4 5
6 7 9
Hard #3
6
9 2 6 1
8 4 3
8 1 7 3
4 7 1
3 9 4
3 2 4
9 1 3 8 6
6 9 7
Hard #4
9 2 6
4 8 6 9
6 7 4 1
6 5 1 3 8
2 7 9
3 7 2
6 8 2
7 9 8
4
Hard #5
8
8 2
9 6 4 2 1 3
4 9 6 5
2 6 8
9 8 5 7
1 6 9 2
5 4 1
3 2
Hard #6
3 7 1 5
6 3 5 7
4 3 2
2 7 5 3
1
8 6 4 9
4 3 6 9
5 2
6 7 9
Hard #7
3 4 5 1
8 3 6
6 8
1 2 3 8 5
9 4 7
7
1
5 7 9 8 4 2
8 6 5 1
Hard #8
3 9 6
2 3 4 7
9 4 7 2
4 1 7 5
9 4
8 1 6 2
1 4 8
8 5 6
3 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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