Printable Hard Sudoku

Set 1xpwkk6. 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
3 2 9 5
1 3 2 4 8
2 7
7
6 5
2 4 9 1
7 6 4 9 8
2 3
1 9 5 7
Hard #2
3 9 4 5
7
8 5 1
4 2 9 3 8
9 4 1 6
2 6 8 9
1 3 7 4 2 5
5 3
Hard #3
1 4
8 5 7
9
1 4 8
3 9 5 6
6 8 4 7
4 2 7
8 2 4 9 3 1
7 6 9
Hard #4
9 1 2 3 5
8 1
8 4
5 6
5 2 7 3 6 9
4 1 5
9 8 1
5 3 7
4 1 2
Hard #5
9 5 1
4 2 6
4 9
2 5 1
8 6 3
6 4 5 1 7
7 3
9 1 7 6 5
6 1 3
Hard #6
9
8 1 7 5
1 7 2
2 4 3 9 1
3 6 1 5
7 3 8
8 2
8 4 3 6
9 6 4
Hard #7
3 6 2
8 6
4 2 5
6 3 7
8 4 5
9 4 7 6
3 5
2 5 9
6 9 1 2 7 8
Hard #8
9 3
5 7 4 6 1
7
8 1 4 9
6 8 1
9 5 7
9 5 1 2 4
6 5
3 5 6 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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