Printable Hard Sudoku

Set 57qckl. 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 6 8 2
8 3
5 4 1 3 9 6
5 4
9 1 3 6 2
9 3
7 2 3
6 3 8 5 7
Hard #2
4 2 3 1 6
6 5 8
1 3 2 7
6 8
3 2 7
4 7 3 2
9
9 2 1
8 7 5 3
Hard #3
5 4 2 3 8 1
3 6 8 4
2
8 5 9
2 1
7 9 8
7
1 7 3 2
1 2 5 7 9
Hard #4
7 5 1
1 2 6 8
9 7 6
1 7 5
6 1
7 5 6 1 3
8 6 7 2 1 5
4
6 9
Hard #5
7 5 1
2 1 9 4
6 4
1 9 5
7 6 9 8
3 2
1 5
5 8 3 1 2
6 8 5 3
Hard #6
5 2 6
9 6 1
3 4 2 9
9 6 4
6 7 2 5
5 8
6 4 7 1 5
2 9 6 3
7
Hard #7
8 9
1 7 8 6
9 3 8 2
9 2 6 5
5 8 9
1 6 9 5 3
2 8 5
6 7
4 2
Hard #8
3 4 1 8
5 8 4 7
1 9 3
7 9
4 5
2 7 3
4 5 1 7
1 3 5 4 8
6 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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