Printable Hard Sudoku

Set oms215. 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 7 1
6 9 5 7
9 8 2
8 7 3 1
9 6 4 8
5 3 6 7 9 2
9
1 8 7 5
Hard #2
3 2 6 8 5
5 8 2 9 4
5 2
3 9 6
9 1 4
3 4 7
9
6 8 3
1 5 6 8
Hard #3
5 9 7 6 4
7 3 9 6
8 7
7 3 5 4
6 3 5
7 8 4 6 1
1 6
9 1 3 2
Hard #4
5 1 6 4
2 1 6
9 2 4
8 1 5
1 9
7 6
3 8 9
6 3 7 2
2 7 8 5 1
Hard #5
1 2 7 9
5 8
3 7 1
4 9 8 6
1 9 7
5
8 3 4 5
3 6 4 2
7 1 9 3
Hard #6
9 7
1 2 5 8 4
7 9 1 2
7 5 8 2 1
3 1 6
4 6 9
5 1
7 9 3 2
3
Hard #7
6 5 9
6 2 4 3
3 9 1 2 8
4
1 6 9 3
5 8 6 1
5 4 2 9
4 5
1 4
Hard #8
1 3 6 2
1 7 6 3
8 9
5 7 8
7 9 1
2 5
8 1 4 2 9 5
4 6 9
9 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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