Printable Hard Sudoku

Set eeey1o. 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
3 5 9
1
6 3 8 4 5
9 5 8 4
1 6 2
7 5
8 4 2
8 6
2 4 1 6 3 7
Hard #2
7 3 5 4
1 6 7
6 7 9
4 6 7
7 5 8 1
3 1 8 5
4 5 9
2 3 5 4 8
Hard #3
6 9 4 5
7 9 6 2
2 8 3 5
4 9 7
8 1
6 5
8 4 7
8 7 3 5 9
1 3
Hard #4
5 8 2 3 1
7 6 4
3 4
9 6 5
6 3 1 9
1 9 8 7
2 3
3 8 1
8 2 7
Hard #5
8 2 6
3 9 8 4
2 7 3
5 7 2 6 9
8 1
4 9 3 5
8 5 4
5 1
6 9 8
Hard #6
8 2 9
1 8 4 9
6 1 4 3
6 1 5
4 2 3
2 3 7 6 9
5 3 2
9
8 6 2
Hard #7
9 5 8
2 6 9
3 5 7 2 4
2 6 7
5 4 8
4 9
8 2 1
3
7 1 8 9 2 6
Hard #8
4 2
5 7 6
1 3 5
1 2 6 7 4
4 2
3 5 9
3 2 7 9 6
8 5 2 6
7 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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