Printable Hard Sudoku

Set 1qbb4z7. 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 5 2 6
6 8 4
1 5 6
2 3 8
6 7 4
1 5 4 2
4 3
2 9 4 7
9 1 5
Hard #2
1 4 6 3
7 1
1 8 4
7 6 9 3
9 6 5
3 2 1
3 5 8
4 8 2 9
5 4 2
Hard #3
2 9 1 3 6
9 7 4 1
3 8
1 9 2 7
4 5
6 9
4 2 6
9 3 5 7 2
7 3
Hard #4
6 7 1 8
2 8 6
8 5 1
2 9 6 5
1 4 9
5 8
1 3
8 4 3 2
6 9 2 1
Hard #5
2
5 6 7 8
3 9
9 8 6 4 5
3 8 1
1 2 6
8 7 9
6 5 4 1 8
9 5 7
Hard #6
9 4
2 6 7
6 9 8 2
4 5 2 1
7 8 9 3
2 3 4 9 7
8
5 1
6 7 5 1
Hard #7
2 7
7 8 2 1
9 6 3 4
9 4 5 8
6 4 7 2
5 7 1 9
4
8 9
3 2 5 8
Hard #8
7 8 1
1 4 3
6 3 7 9
3 6
8 9
1 4 5
3 6 8 9 7
5 7 9 6
1 7 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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