Printable Hard Sudoku

Set 1lra9bx. 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 6 3
8 9
5 7 9
5 8 3
2 9 4 8
1 9 3
6 1 2 5
1 4
3 7 2 5
Hard #2
2 4
7 1 3
3 2 9 7
6 9 1
3 7 6 8 2
1 7
1 6 2
6 9 3 4
8 5 3
Hard #3
3 8
4 3 6
5 1 6
2 3 4
7 1 9
8 5 2 1
1 8 5
5 3 8 4 9
7 4 9
Hard #4
4 5 3 6 9
6 2 8 3
8 9 7
8 7 5 2
5 2 3 1
2 7 4
2 8
6 1
1 7
Hard #5
5 7 8 6
3 1 6
9 8
2 3 6
2 7 4 1
6 8 3 9 2
7 3 9
8 5 1
5 7
Hard #6
5 2
1 8 9
8 6 3 2
3 6 8
9 4 6
4 9 2 5
5 4 8
8 2 7
7 3 5 1
Hard #7
9 4 8 5
9 6 7 2
9
6 1 2
1 5 8 4
5 4 2 6
2 8 7 3
1 2 3
9 1
Hard #8
5 1 4 6
4 8 3 9 5
1 9
4 3 9
2 3 7 4
7 8 5
5 1 9
8 6
3 7 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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