Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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