Printable Hard Sudoku

Set 1qz15au. 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 6
4 5 3 9
2 7
3 7 1 5
4 8 1
6 8 2
8 5
2 3 1 7
4 7 5 6
Hard #2
9 6
1 6 7 5 8
6 7
5 2
2 7 5
8 1 3 7 6
6 5 1
3 8 4 5
4 1 9
Hard #3
8 6
6 2
2 1 6 9
7 3 5 1
8 1
7 5 3 2
8 7 2 4
3 5 7
1 5 4 2
Hard #4
5 3
8 9
8 3 7 1
5 1
9 5 2
4 7 8 5
9 5
5 6 2 3 7
1 7 6 5 4
Hard #5
7 1 9
1 9 6 4
5 2 6
9 3 5 2
3 5 2 6 9 7
3 5
1 4
8 2 9 4 6
Hard #6
2 3 9 7
7 4 2
8 9 2 1 3 4
9 2 8
7 1
2 5 4
6 1 9
3 2
5 4 9
Hard #7
7 5
8 2 6
6 9 4
8 6
3 1
4 6 3 5
1 6 2 5 7
8 5 9 2 4
9 3 2
Hard #8
4 2 9
5 8 2
6 7 8 4
5 7
8 4 5 3
1 6 8
9 8 6 3
9 5 1 7
3 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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