Printable Hard Sudoku

Set 569j5i. 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
1 3
4 2 6 1 9
9 7
2 7 6 8 5 4
4 2 1
6 8 4 9
3 2 4 9
9 1
6
Hard #2
1 9 8 5 4
2 6
4 3 9
9 5 8 2
8 4 9 7 6
3 7 6
8 4 9
7
5 1 8
Hard #3
6
2 1 3 4
7 6 1 8
4 9 1 6
8 7 6 2
4 8
8 1 6 9
5 9 3
1 6 7
Hard #4
6 8 3
1 7 6
2 3 8
5 3
5 3 9 8 6
7
1 2 9 4
3 5 2 1
7 3 8 2
Hard #5
6 7 3 8
7 8 6
9 5 6 4
5 1 6 8
2 8 7 5
1
2 4 3
1 2 8
8 6 3
Hard #6
6 7 9
2 4 3 7 6
2 4 1
9 8 1 5
3 2 6
5 1 9
8 2 5
5 6
1 3 7
Hard #7
6 4 9 5
9 1 6 8 3 7
5
8 9 4 6
7 2
6 3
1 7 2 8 3
4 8 1
5 9
Hard #8
6 1 8
4 2 5 8
2 7
6 1 4 8 7
2 8 4
6 3
5 8 3 1
4 6 3
3 4 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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