Printable Hard Sudoku

Set 1c3wopi. 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
4 3 9 1 2
6 4
1 7 8 9 5
4 9 8 7
1
4
9 6 1 8 5
2 3 7 9
7 9
Hard #2
1
5 8 3 4
5 1 2
9
9 3 7 5
2 8 6 4 7
8 7 3 6
5 7 8 3 1
9 7
Hard #3
1 5 4
7 2 4 5
5 2
6 9 3
4 8 2 1
9 6 8
1 9 4 2
8 4 2 1
6 5
Hard #4
9 3 7 2 6
2 3 5 4
2 7 9 3
4 2
5 1 4 9
5 3 8
3 7 6
8 4 5 1
Hard #5
5
1 5 2 3 4 8 9
7 6 9 1 4
8 4 6 3
1
7 2
9 4 2 1
6 5
3 9 7
Hard #6
6 3 4 9 2 5
9 5 7
5 6
8 5 4 6
2 6 9
8 1 2 7
3 5 9
1 2 8
5
Hard #7
2 6
1 8 7 5
3 9 1
9 3 1 2
4 1
6 8 1 5
1 8 5
6 5 8 4
8 7 1
Hard #8
3 9 8
2
7 2 5 9
1 6 3 9
9 2 6
8 6 4
3 8 7 1
1 4 9 3 2
6 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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