Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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