Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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