Printable Hard Sudoku

Set 1n4d77n. 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 6 3
7 8 5
3 9 2
5 4 8 2
3 2 8
7 4 3
1 4 6 8
5 6 4
3 5 1
Hard #2
2 3 5
3 5 7
4 7
3 2 5 6 1
6 4 8
1 7 3
7 9 8
3 8 5 2 4
1 6
Hard #3
4 3 2 9
5 7 9
1 9 5 6
3 5 9 4
5 4 6
3 8 7
6
8 4 3 1
7 9 8
Hard #4
3 5 4 9
9 7
2 9 6
8 6 3
4 3 7 6
9 5 7
6 2 4 8
6 2 1 5
4 7
Hard #5
4 7 9
2 3 7 8
7 9 8 6 1
1 4 6
6 8 5 9 4
1 9
7 6
6 9
5 3 6
Hard #6
1 3 7
7 3 4 1
5 6 4 8
7 9 1 5
3 6 8
9 8
1 7
9 6 4 8 2
4 5
Hard #7
4 2
9 6 5 1
8 7 4 3 6
8 4 6
9 3 6
1 4 7
5 6 1 4
2
9 6 7 2
Hard #8
5 4
7 2 9 6 5
4 1 9 3
7
5 4 2 8 9
1 8
3 5 7 8
1 5 4
5 9 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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