Printable Hard Sudoku

Set 176o4f2. 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 1 8
7 1 2 5
4 7 1
5 9 1
3 4 8
3 6 2 1 5
4 5
5 8 9 4 2
Hard #2
9 7 8 6
3 8
6 3 9
2 3 1 8 4 7
8 9 4
5 8
7
4 9 2 1
8 5 1 9
Hard #3
3 7
7 8 2 4 1
5 2 3 6
2 6 5 1
6 2 9 8 3
7 1
3 7 8 5
7 2 9
Hard #4
9 7
7 6 3
5 8 1
3 4 7
4 2 5 6 8
1 6
8 3
7 1 6
9 1 6 5 4 7
Hard #5
7 4 5 8
1 2 4
9 3 2 7
6 1 2
4 9 8
5 2 8 6
2 3 5 7
7 3 5
6
Hard #6
2 9
6 7 3 4
2 6 7 1 5
4 1 7
6 9
9 1 8 4
2 9 8
7 8 1
6 3 5
Hard #7
4 8 5
1 5
5 1 4 9
5 7 3
3 1 6 7
6 5 9 8
7 2 6
5 4 6
1 3 4
Hard #8
2 8 5 7
3 1 2
8 7
9 7 8
7 3 2 4 1
4 7 1 6 9
4 5
6 2
5 7 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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