Printable Hard Sudoku

Set 1dp3i99. 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 1 4
5 3 7
1 4 2 6
8 5 6 2
9 5
1 7 9
6 4 2
5
4 9 1 8 3
Hard #2
2 5
9 5 3 4 7
3 8 4 9
2 5
7 9 1 2
1 7
4 2 7 3
5 8 7 9
9 6
Hard #3
6 1 2 4 5
6 1
2 3 5
5 8 6
1 3 8 7
8 7 4
9 6
5 8 9 3
3 8 9
Hard #4
1 4
7 5 4 6
4 9 1
2 1 6 7
6 3 9 8
4
9 2 7 4
2 1 6
7 9 3 2
Hard #5
3 9 6
7 5 3
3 7 9
1 2 3
1 4 3
8 4 2 9
6 1 2 3
7 8
4 6 5 1
Hard #6
4 7
6 9
1 2 8 5
8 5 1 4
8 3 9
4 5
4 2 1 9 7 6
5 4 9
6 3 8
Hard #7
3 9 6
5
7 8 5 1
6 2 4 3 1 7 9
5 4 2 3
7 9 6 5 2 8
8 7
3 4
Hard #8
3 1 4
6 2 4
5 3 9
1 5 9
6 1
3 4 7
6 1 3 7 2
2 9 6 1
5 3 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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