Printable Hard Sudoku

Set 1wf6uv7. 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 1 4
9 7
3 6 4 9 5
1 4 8
2 6
8 3 4 9 1
5 9 4
9 8 1 6 7
Hard #2
3 6 2 8
6 9 5
1 2 7 5 3
2 3 5
3 1 6
5 4 2 7
5 8
9 5 7
1 2
Hard #3
1 7 2 5
4 8 3 6
5 1 9 2
7 5
2 4 5 3 9
2 8 1
7 6
6 2 4
5 9
Hard #4
1 9
5 2 8 9 3
3 7 5 6 4
4 6 1
7 8 6
6 9 5
2 8 1 4 9
8
4 7
Hard #5
2 5 8 1
1 5 4 6 2
8 4
2 5 7
9 3
6 2 3 5
2 4 7 1 3
9
7 8 2
Hard #6
1 3
8 7 6
2 1 6 7
1 8
2 9 1 8
8 3 5 9
6 5 3 4
5 4 7 8
1 6
Hard #7
8 4
5 4 1 9
1 7 9
2 6 5 7
9 5 1
7 1 3
3 6
9 5 2 1
7 8 6 5
Hard #8
3 7 4
8 5
5 7 1 4 3
9 7
8 6 4
7 4 1
3 2 8 1
7 5 1 6
1 7 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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