Printable Hard Sudoku

Set 1od83d8. 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
5 4 8 9 7
1
9 3
2 7 4 3
4 5 1
1 4 2
7 9
9 8 1 2 7 4
6 7 8
Hard #2
7 9 8
1 5 4
5 2 7
6 2 7
2 9 6
8 1 7 6
8 1 4 3
6 1
2 4 5 9
Hard #3
8 3 4
2 6 7
1 6
2 5 7 8
5 7 6
6 1 7
1 2 8 4
3 5 7
9 6 3 5
Hard #4
9 1 6 5
5 1 9 4
8 4 9 6
1 9 7
6 3 2 8 7 1
7
6 5
3 1 8
6 9
Hard #5
9 5 2
2 4 6 5 8
8 5 3
4 1 9
9 2 5 4
7 6
4 1
3 6 5
8 9 6 4
Hard #6
7
1 5 8
6 4 7 1
8 9 1 2 6
1 5 3 8
7 2 8 4
4 5 2 9
2 6
9 3
Hard #7
4 9
7
3 1 8 6 7 4
5 3 4 1 6
6 1 9
7 5
7 4 2
9 2 8 7
1 3 5
Hard #8
2 9 1
1 5 7
6 5
7 8 3
4 9 7
3 6 4 9
2 1 6
5 1 7 4
2 8 5 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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