Printable Hard Sudoku

Set 1k66d23. 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
6
7 4 2
2 9 1 8
2 6 9 3
7 6 5
1 5 9 2
4 6 2
2 8 3
3 5 7 4
Hard #2
9 4 2 6
6 1 5
5 2 9
7 4 5
2 7 1
3 2 8 6
9 4
5 6 3 9
2 6 1
Hard #3
8
3 4 7 6 8 2
1 9 7
9 5 6
6 8 2 7
3 8 1
9 4 8
6 1 7 9
4 2
Hard #4
3 1
9 1 2
5 6 4 8
9 4
2 4 5 3 9
5 9 6 3
7 8 9
6 7 5 8
3 7
Hard #5
3 8 1
6 1 2 7 9 8
2 6 1 7 4
2 9 3
3 9 2 1
4 1
1
6 5
4 9 6
Hard #6
7
3 5 1
6 2 4
6 9 7 8
2 4 7 5
1 3 2 6 4 8
4 1 7 5 9
5 2
1
Hard #7
7 8 2 3 1
3 1 9 5 8
5 1 4 7
2 5 9
9 8
4 1 7 2 3
6
7 3 4 2
Hard #8
4 1 9 7
7 6 8 9
6 3
2 5
7 9 3
9 2 4 7 6
5 3 6 8
7 1 2
1 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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