Printable Hard Sudoku

Set 1d5w0do. 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
7 4 2 1 5
5 2 8 7
6 3
6 5 2
3 8
8 5 6 9
4 6 2
9 8 4
3 8 5
Hard #2
9 2
7 1 6
4 1 5
6 9 3 7 8
2 9
3
6 3 1 9
8 9 1 5
9 4 6 2 7
Hard #3
1 3 6 5
2 7 9 4
4 8 2 1
9 4 7
8 1 4 7
9 6
5
1 9 8 3 5
3 4
Hard #4
4 6 5 1
8 9 7 5
9 7 3 4 2
9 7
6 2 3 4
6
7 3
3 2 6 8
1 6 7
Hard #5
6 3
1 9
5 7 2 8
3 5 2
1 8 3
8 7 2 4 9
3 6 5 7 8
7
1 8 4 9
Hard #6
5 7 6 8 1
6 5
4 7 2
1 9 4
6 2 8 3
8 5 1
2 5 6
4 5 7 9
1 5
Hard #7
6 8
8 6 7 5
1 7 3 5 9 6
8 4 6 1
2 3 4
3 7
5 2 4
6
3 9 7 4
Hard #8
7 6 4 1
4 9 7 3
5 8 2
2 7 6
1
2 3
5 8 7 4 2
7 2 1 8
6 5 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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