Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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