Printable Hard Sudoku

Set ljb47n. 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
2 8 5 9
5 2 6
4 3 9 1
7 9 6 4 3
8
1 7 5 4
8 1
7 6
2 1 6 3
Hard #2
9 8 3
7 6 2 8 9
1 8 5
8 3 5
7 4 5 2
5 6 4 7 3
9 8
1 4
3 5
Hard #3
6 7 2 5
1 3 6
5 1 3 6
8
2 5
8 7 9 1 3 6
2 7
9 8 5 2
3 6 1
Hard #4
5 2 3 7
3 6 2
2 9 6
6 1 3 5
4 6 7 1
7 1 4
1 3 7
8 4 9
4 1
Hard #5
6 2 3
5 1
7 4 1
4 6 5 7 9
8 4
2 5 7 6
4 2 1 5
8 9
3 9 5 2
Hard #6
1 4 8
3 1 6
8 4 9 7
7 3 5 9
6 4 8 5 2
3 6
9 5 3
6 4 2 5
2
Hard #7
3 4
4 7 3
7 6 9 1
7 4 2 5
2 3 7 8
6 4
2 3
7 1 8
5 1 8 6 7
Hard #8
9 8 5 1 4 2
6 2 5
9 3
7 1 6
4 2 1
8 4 9
1 5 9
9 1 3
3 7 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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