Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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