Printable Hard Sudoku

Set qu1fp. 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
4 2 1 5
1 5 4 2
4 7
1 6 5 9
6 9 1 2
3 7
7 6 4
1 6 8
8 2 5
Hard #2
5 3 2 7
9 1 6 5
9 4
4 5
2 4
1 2 9 7 8
6 2 3
7 1
2 7 9 1 8
Hard #3
1 6
8 3 5 1 2
2 7 3
3 1 9
7 2 8 1 5
6 4
1 6 3
8 2 4
8 1 5
Hard #4
1 3 7
7 8 9 5
3 8
7 4 9 5 8
7 4 5
8 1 2 3 9
2 3
9
4 9 7 1
Hard #5
6 3 7
8 2 4
4 3 6 8 1
9 3
8 4 2
7 3 4 2 5 8
5 9 1 6 2
1
7
Hard #6
1 5 3 9 7
7 1 6
3 6 4
1 6 3 9
5 1 6
4 5
1 8
4 6 9 2
2 4 5
Hard #7
3 8 4 2 7 5
5 2 9
2 6 9
1 9
6 7 3 5
2
9 3 2 7
7 1
5 3 6 4
Hard #8
8 3 1
6 2 4
7
5 6 2 1 3
1 5 8
2 7 8
9 7 3
5 2 4
3 4 9 6 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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