Printable Hard Sudoku

Set 1tqoj7v. 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
1 8 6 3
5 2 9 1
5 1 6 2
7 4 8 1
4 7
2 4 9 3
8 9 1
9 1 5
Hard #2
7 9 8 5
5 7 9
1 6 2
6 1 8 3 5
2 1 8
4 9 6
5 4 1
2 5 3
6 9
Hard #3
3 7 4 1
4
4 8 3 6
6 9 1 7
9 3
3 7 5 2
7 9 1 3
8 7 6
2 3 1
Hard #4
5 8 9 6 4
1 5 9 7
3
9 7 3 8 2
5 1 9
6 2 8
3 7 6
3 2 4 5
1
Hard #5
8
8 5 7 9
9 2 5
4 7 1 2
9 6 4
7 4 6
2 8 6 7
6 3 4 9
3 5 6
Hard #6
8 3 2 6
1 7 9 3 5 8
8 5
4 3 6
8
5 4 7 1
2 6 9
1 5
6 2 9 4
Hard #7
4 7
9 4 1 8
6 3
8 5 1 4 6 2 3
7
4 9 1 7 2
6 7 3
4 3 7
5 6
Hard #8
5 2
6 8
9 7 1
3 8 6 7
7 2 5
4 7 2 8
7 2 1 6 5
2 4 7
5 3 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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