Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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