Printable Hard Sudoku

Set 1bd3dnq. 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
9 6
2 7 5
8 7 5
2 6 3 8 9 7
1 2
9 4 7 8
6 7 4 3
8 3 1 7
Hard #2
1 3
4 6
3 2 4 1 9
2
9 1 8 6 4
7 5 6 4 1
9 1 6 2
4 7 8
7 8
Hard #3
5 2 7 9
4 8
7 1
2 6 9 3
4 2 5 8 1 7
6
5 4 6 3
8 2 4
7 5 8
Hard #4
1 2
3 4 7
6 7 4 3 8
3 8 1 2 4
8 4 6 5
7
4 5 9 6
6 2
8 7 3
Hard #5
4 2 1
9 6
5 3 9 4
7 6 2
8
5 9 2 3
8 1
5 1 4 9
5 3 9 6 7 8
Hard #6
1 8 3 9
7 5 9 1
2 6 3
4 1 2 9 5
8 9
6 1 2 7
4 1 2
9
7 6 8
Hard #7
7 1 2
9 1 2
2 3 5
7 5 4 6 2
9 7 8
1 7 4
2 6 4
4 6 7 9
8 1
Hard #8
7 1 4 6
9 3 7 4
8 2 3
4 3
5 6 4
3 6 8 7
3 2 5
4 1 3
2 8 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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