Printable Hard Sudoku

Set 1305ic8. 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
1 3 6 8 9
8 5 6 1
9 2
3 2 7
9 4 3 5 6 1
3 5
4 1
1 7
6 4 3
Hard #2
7 6
5 6 9
2 3 4 5
6 8 3 9
4 7 1 8
7 3
1 5
3 4 9 2
9 1 8 4
Hard #3
3 1
1 4 5 6 3
9 8 7
6 3 9
1 2 8 5
8 4
4 2 7 6 3
8 3 6
2 9
Hard #4
7 4 9 5
3 1
9 3 1 4
6 2
8 5 9
3 5 4 7
9 3 8 6
4 8 2 5 1
1
Hard #5
3 5 8 9 2
8 1
7 8
9 6 5
3 8 5 4
4 3 6
2 4 9
4 7 3
8 2 1 3
Hard #6
4 8 6 3
7 2 4
5 7 9 8
7
1 4 6 2 7
9 4
2 4 1 5 3
6 7
3 8 2
Hard #7
9 6 4
8 3 4 7
4 1 3
3 5 8
8 5 2 1
2 6 7 9
4 5 6
6 4
5 8 2
Hard #8
9 3 1
2
6 1 8 5 7 9
7
7 6 4 3 9
4 6 5
2 4 5 9 7
2 4
1 7 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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