Printable Hard Sudoku

Set b6qv25. 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
4 8
6 5 1 9 7
4 3
9 4 8
5 8 4 2 1
8 7 1 4
5 1 7 6 9 4
6 2
Hard #2
5 6 9 1 4 2 7
7 3 8 5
9 1
1 3
9 5 6 7
7 2 9 3
9 2 7
3 8
5
Hard #3
4 6 5 9
1 9 3 8
6 2
9 4 2 7
2 1 9 5 6
8
9 4 8 1 5
7 9
5 4
Hard #4
9 4 5 8
2 7 8
1 2 6
3 5
8 2 1 7
5 1 4
3 1 6 9
5 3 1
8 2 5
Hard #5
2 9 3 8
4 6 3
7 5 4
8 6 4 9
6 2 7 3
9 4 8
3 8 6
1 7 8 2 9
Hard #6
3 9 6 4
6 5 8
7 6
1 8 4
4 3 6 5 7
9 8
1 2 7
7 2 5
4 9 3 6
Hard #7
2 7 9 6
9 1 5
4 8
7 3 6
5 7 4
4 8
2 3 9
1 5 2 3 6
9 7 5 8
Hard #8
2 1 6
2
5 7 3 1
8 6
3 2 8
1 6 2 9 7
7 5
4 8 3
2 8 4 7 5 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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