Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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