Printable Hard Sudoku

Set 11d4vja. 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 4 2 6 8
5 8 9
3 7 9 6
6 8 5
3
9 7 2 4
8 6 3 1
2
3 9 8 2
Hard #2
6 9 3
2 4
2 8 6 7
7 4 2 1
8
3 5 8
5 9 2 8 4
6 4 5 2
3 5 1
Hard #3
7 4 9
2 8 3 5
3 6 1
7 9 2
2 8 5 6 9
1 4
9
8 1 6
6 1 3 5 4
Hard #4
7 8
3 6
1 3 7 9
3 4 2 9
6 4 1
7 9 6 4
2 8 4 9 7 1
5 2 6
3
Hard #5
1 2 7 5
4 2 9 5
6 4
6
6 1 7 5
7 4 6 1 2
5 6 4
5 2 8
8 9 7
Hard #6
4 8
9 7 1 4
3 2 6 4
5 2 3 7
4 7 8 6
1 3
7 1
1 3 8 2
2 6 7
Hard #7
1 8 7
7 2 5 1 3
1 8
7 1 2
5 3 1
6 1 5 9 4
3 4 9 6
4 5 2
8
Hard #8
7 2 8
6 5 9
1 5 2
7 5 4 1 6
9 8 5
4 6 8
2 9
6 3 7 1
1 8 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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