Printable Hard Sudoku

Set tv51pd. 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
8 2 6
5 4 3 8 7
4 3 1 6
4 3
2 7
9 8 3
5 2 9 8
6
9 8 1 4 2
Hard #2
3 1
1 8 4 2 5
7 8 3
3 2 4 6
4 9
6 1 8
9 4 3 2
1 9 8 5 7
5
Hard #3
4 9 1 5 3
2 8
8 9 2
1 6 4
4 2 7 9
6 4
3 8
9 2 5
5 2 8 3 1
Hard #4
5 4 2
5 2 8
3 9 5 7
6 5 4 9
4 2 7 8
6 1
9 4 6
8 1
3 5 4 7
Hard #5
1 8 4 6
6 9 1
7 5
2 1 6 3
4 7 3
8 1 2 9 7
3
4 2
9 5 4 3 2
Hard #6
8 3 1 4 5
9 6
8 3 1
8 1 9
5 7 2
5 2 4
8
5 3 7 4 6
7 3 9 2
Hard #7
5 7 6 1
2 7
8 3
1 2 8 3
4 3 9 8
3 9 6
5 2 4
9 6 8 2
2 1 9
Hard #8
1 4 6 7
8 6 5 9
4 1
5 9 6 1
3 5 8
7 2
7 2 4 6
2 9 3
6 8 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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