Printable Hard Sudoku

Set 1opu7wn. 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
2 5
9 1 5
6 2 3 8
4 5 3 1 7
2 7 9 4 1
2 3
7 6 8 2
6 8 2 3
Hard #2
3 4 1
8 2
1 2 6 9
7 8 9
5 9 2 7 8
8 7 5 3 9
7 8 2 6
4 9 7
Hard #3
4 2 1
9 6 4 5
2
4 2 6 7
9 1 8 7 5
5 7 9
5 8 7 3
3 9 2
3 6
Hard #4
4 7 1 8 3
8 4 9 2 7
5 9
2 8
8
1 3 7 2 8
9 3 4
7 3 5
4 5 9
Hard #5
6 9
8 1 7 9
1 7 5 3
2 5 8 6 3
3 6 2 4
8 5
1 3 8 2
9 7
3 6
Hard #6
4 5 2 3
2 9 6
9 4 5
6 8 9 3
9 1 6 7
5 9
3 1 5 4 8
6 8 9
3
Hard #7
8 2 1 6 9 7
9 5 4
6
1 4 9 3
9 6 7 8
5 2 4
5 6 2
2 7 3
4 6
Hard #8
1
7 3 8 4
4 8 9 7
2 5
5 9 6 7 3
3 4 8
2 3 7
3 8
4 7 1 5 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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