Printable Hard Sudoku

Set 1n23dnu. 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
7 4 3 2
7 1
6 4 1 7 5
9 1 8
6 4
9 5
5
2 8 4 6 1
6 7 1 8 3
Hard #2
8 4 2 6 1
7 8 3
6
3 7 6 9
1 4 9 7
1
3 1 4
9 5
2 5 1 4 7 6
Hard #3
9 8 5
3 5 1
6 3 4 8 2
6 8
3 1 5 4
5 7 9
3 1
2 5 7
5 9 6 8
Hard #4
1 8 5
9 5 4 8 7
4 3 5
2 7 6
8 3 7 6
6 9 2 7
9 6 1 3
2 7 5
Hard #5
4 9 1 2
6 5 7
4
1 2 8
5 6 8
3 1 4 5
4 8 2 9 1
7 9 5
1 3 4
Hard #6
3 1 8 9 2
9 6 8
9 5
7 3 1 6
3 1 8 7
5 7 6 2
7 9 4
1 8 3
9
Hard #7
4 3
4 2
3 1 2 8 6
6 1
7 6 8
1 3 5
3 2 9
1 3 5
5 2 8 6 9 3
Hard #8
6 2 4
1 4 2
8 5 9 1
1 2 3 4
3 6 7 1
2 9
6 3
4 7 5 6 2
4 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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