Printable Hard Sudoku

Set 126yo0p. 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 5 6
6 8 7 4
4 8 6
5 1 6 7
5 2 8 3
2
7 1 4
8 2 9 3 6
9 5
Hard #2
5 1 9
5 2
9 2 3 5 4
2 3 7
8
1 6 9 5
4 3
2 4 9 1
8 7 9 5 6
Hard #3
3 7 4 8 2
8 7 3
6 5 2 8 4 7
5 6 2 4
2 1 9
6
2 5 3 8
3 2 4
Hard #4
4 8 2
1 9 6 4
2 7 9
6 3 9
8 9 2
7 3 5
9 6 5
3 1
5 2 1 4 6
Hard #5
9 3 6
6 4 8 7
8 5 4
3 6 8 2
1 3
7 3 5 6
6 1 7 9
8 5 7
4 9
Hard #6
7 1
5 3 7
3 1 7 4
2 1 9
5 9 4
5 8
7 6 8 2
4 9 7 6 1 8
3 7
Hard #7
6 5 1 9 7
5 2 6 4
4 8 1
1 9 7
7 5 4
5 7 2 6 8
7 3 5 4
8 5
Hard #8
4 3 1
2 6 8 7 9 4
9
7 9 3
9 8 4 6 1
1 6 2 7
7 4 8
1 6
2 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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