Printable Hard Sudoku

Set 15cbnju. 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
9 1 5
7 4
2 6 9
1 2 4 3
3 6 8 4
9 7 6
2 5
9 8 3 7
5 4 1 6
Hard #2
8 7 4 9
1 3
9 2 4 5
3 7
2 5 4 3 8
3 1 5
4
2 5 9 6 3
9 7 2
Hard #3
9
6 3
4 3 6 7
7 4 3
9 3 6 8
5 6 8 7 1
6 7 9 1 4
8 5
4 2 3
Hard #4
8 6 9
3 9 5
9 5 2 4
2 8 3
1 6 4 2
5 3
3 4 7 1
9 3 7 4
4 6
Hard #5
5 4 8 3
2 3 6 7
6 8 5
3 5 9 8
2 9 1 6
7 2
7 3 2 9 5
2
2 8
Hard #6
8 6
6 3 2 7
7 9 4 6
1 9 5 7
7 9 1
5 7 4
3 7 8
5 3 4
7 1 2
Hard #7
3 5 9 2 4
1 3 2 5
4 6 9
6 2
8 7
9 3 7
9
3 1 5 9 6
8 3 4 5
Hard #8
8 6 4 5 2
9 7 5 6
2 3
2 8 1 4
4 5 3 2 1
2 3 8
7 9 4 8
7 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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