Printable Hard Sudoku

Set 1fni5cz. 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
6 8
9 7 1 4
2 8 1
2 9 3
3 8 7 6 4 1
4 2 5
7 6 2
3 1
Hard #2
3 5 6
8 1 9 5
1 8 6 2
4 7 2 8 9
2 9 5
9 5 3
8 4
6
4 3 2 1
Hard #3
8 5 6 1
4 9
6 1 7
9 7 2
2 4
7 1 2 5 3
5 3 1 8
8 2
6 9 2 3
Hard #4
4 7 5
4 2 3 8
5 6 7
3 2
3 7 9
2 8 5
4 9 1 7
3
2 8 9 5 4 1
Hard #5
2 4 5
3 4 1 7
6 8 7
8 6 2 3 9
3 6
2
5 8 7 2 9
3 1
6 1 9 2
Hard #6
4 7 3 5 9
5
1 6 2 8 3
9
6 9 1 4
7 8 2 5
9 1 5
2 4
5 2 9 1
Hard #7
5 8 4 7 9 1
3 1 2
6 4
9 1 2 4
2 8 7
9
7 6
5 9 8
3 8 4 7 1
Hard #8
3 9 8
5 7 2
1 5 3 2
9 7
3 5 7 1 4
4 3 8
9 3 6
5 6 7 1
8 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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