Printable Hard Sudoku

Set 165upbq. 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 9 4
6 5
6 2 9 5
1 5 9 8
6 9 2 8 4 1
9 6 2
1 6
2 8 6
4 3
Hard #2
6 5 8
7 3 4
2 4 9 7
4 5 6 2 8
5 2 9
6 1 8 4
5 3 9
4
7 1 4
Hard #3
1 9 8 5 6
1 4 5
1
1 7 9 8
8 3
5 8 7 2
4 2 9 1
8 5 4 3
2 5
Hard #4
1 2 3 5
4 1 7 9 2
4 5
1 4 8 9
4 5 2 7 3
9 4
6 7 1
2 8 9
6
Hard #5
5 3 8 1 2
2 8
4 2 5 1
1 5 8
7 3 9 1
2 7 8
3 4
1 2 8
8 6 7
Hard #6
1 6 2 5
2 7 6
4 8
6 2 4
4 8 1 7
6 3
3 5
7 9 5 2
4 8 1 7 9
Hard #7
7 8 6 1 4
1 4 3 7
7
4 6 2 1 8
5 1
9 2 6
9 6 2
5 4 8 7
3 2
Hard #8
2 5 1
1 2 9 4 7
1 6
5 7 3 9
8 6
9 4 1
5 7 4
8 9 3 2
8 4 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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