Printable Hard Sudoku

Set 10z7f21. 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
6 5 3
3 8 2 4 7 1
1 2
6
2 3 7
1 3 8 4 5
7 4 6 2
6 4 5 7
Hard #2
2 6
5 4 6
8 4 1 3
4 5 1
2 8 6 9
8 6 4
7 4 3 2 6
6 1 9
6 9
Hard #3
4 8 7
1 2 5 9
8 7 4 6
6 3 4 2
2 4 5
5 6 9
8 7 1 5 9
5 3 2
Hard #4
6 4
5 4 9 2
9 2 1
5 6 3
8 6
9 4 1
1 2 7 5
3 1 4 6
6 9 1 8
Hard #5
5 9 2 1
3 8 4 7
2 5 4 9
8
2 4 5
1 3 9 6
2 6 7
7 8 9
1 5 3
Hard #6
6 4 7
3 1 8
3 2 4 8
8 5 6 4
6 1 3 9
5
9 8 3 7
1 4 8
6 1 5
Hard #7
9 4 1 8 3
8 6 3 7
1 9 8 2
1 5 2 7
6 7 4
7 8
4
3 8 7
2 3 5
Hard #8
8 5 7
6 1 2 8 5 9
7 6
9 8 4
8 3 5 2
3 6
1 5 7 3 2
7
5 9 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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