Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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