Printable Hard Sudoku

Set 10y4i67. 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
7 4 6 3
8 9 1
3 1 5 9
5 6
4 5 2
7 3 2 9
9 4
6 1 7
1 8 7 5
Hard #2
4
2 1 4 5 9
5 8 6 9 3
6 1
9 8 2
7 3 9
3 9
1 9 7 8
7 6 4 2
Hard #3
1 6 5 9
5 9 3
3 4 7 1
6 8 9
2 1 7
3 5 6
8 5 4 9
3
1 3 4 6
Hard #4
1 8 3 7
1 2 5 9
9
4 2 6 1 3 7
3 8 5 4
1 6
8 3 6
9 6 8 1
7
Hard #5
7 1 8 3
2 4
9 8
1 4 5 2 7 3
3 5
3 1 9 2
2 4
5 7 8 6 2
9 2
Hard #6
7 8 1
1 2 3
5 6 1 9 7
3 2
1 8 7 9
3 2 4 5
6 4 9 2 5
4 9 7
Hard #7
2 4 8 9
3 2 7
5 1
5 2 4 1
5 3 9 7
8
7
8 3 6 1 7 5 2
5 2 3
Hard #8
8 1 3 4 9
2 9 7 5
4 9 7
8 5
1 6 5 9 2
4
4 9 6 5 2
1 3 8
8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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