Printable Hard Sudoku

Set 1c06j0i. 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 6
9 5 1 2 3
1 4 7
2 5 4 6
7 5
6 9
8 9 6 3 1 2
3 7 4
8 5
Hard #2
2 5 4
1 8 9
7 1 8
4 1 2
6 8 5
9 3 7
6 9 5 2
1 5 7
3 2 5 8
Hard #3
1 3 2
4 9
8 1
2 7 8
1 4 3 2
2 3 7 4
8 5 3
5 6 2
4 7 1 5 8
Hard #4
8 3 6 7
9 5 8 3 6
7 9 2
6
7 4 2
4 8 5
3 6 1
8 2 7 9
4 9 3
Hard #5
5 2 4 7
7 9 5 1 6
6 7 8
9 3 2
8 5 1
3 1 9
1 5 4
9 8 7 6 1
Hard #6
8
1 7
7 5 3 8
4 2 9 7 6
7 4 5 3
9 3 1
6 1 9 5
4 9 5
8 7 1
Hard #7
6 8 4 1 3 9
2 9
2
3 7 9 4 1
3
1 3 2 7 5 6
1 6 3
6 7
9 1 7
Hard #8
1 5 8 7
8 7 2 1 9
3 1
8 6
7 4
5 9 2
1 5 3
5 6 1 4
4 3 9 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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