Printable Hard Sudoku

Set 1v6i42c. 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 4 7
8 4 2 5
5 2
3 6
1 3 8
2 6 5 9
1 9 8
3 6 1
9 5 1 2 4
Hard #2
4 7
8 2 5
5 6 2 4
3 8 9 4
6 2 9 1
5 8 7 3
1 8 7
9 3 6
4 7
Hard #3
5 2 3 1
1 3 7 4
8 6 9 3
8 9 7 4 6
7 1 2 3
2 3
7
4 2 1
9 7
Hard #4
6 7 4
7 1 5
4 8 7
4 9
8 9
2 1 3
2 9 8
4 6 3 8 7 9
8 9 4 5
Hard #5
2 3 9
5 3 7 2
1 2 5 4
5 7 9 8
6 2
7 8
3 1 8
8 4 3
4 5 7 9
Hard #6
6 4
1 8 4 7
4 2 5
8 3 5 6
7 5 9 1
4 3 5
4 8 9
5 7 4
7 2 1
Hard #7
1 2 4 3 9
6 7
3 5
8 2 3 6
8 7 6
2 7 1 3
8 4 6
4 5 8
6 4 1
Hard #8
5 2 4
4 8 7 5
1 4 2 3
4 5 7
6
2 7 5 6 1
1 9
4 5 8
6 2 7 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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