Printable Hard Sudoku

Set hkh48h. 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 6 5 3
2 7 5 4 3
2 3 5
7 8 3 9
3 9 6 8
9 2 8 5
1
4 2 5 7
Hard #2
5 4
7 1
1 5 8 9 7
5 3 1 9 2
9 2
1 3 2 9 7
6 4 5
7 8 6
2 4
Hard #3
4 8 2 3
7 5
5 2 4
1 5 3 4
3 8 6 2
7 1
5 2 8
2 8
8 4 3 2 9
Hard #4
4 6
6 7 4 9 2
3 9 8
8 9 6 7
7 5 1 3
2 7 6
9 8 7
2 3 8 6
3
Hard #5
8 7 4 9
9 5 3 4
2 7 8 9
1 4 5 9
1
3 5 1
6 3 7
2 7 8
2 1 5
Hard #6
4 3 9 6 7
2 4 8
9 1 5 6 4
1 7
7 5
7 8 5
9 1
2 7 5
1 4 8 6
Hard #7
7 2 4
9 4 7 1
1 8 5
1 5 4 3
4 2 5 8 6
9 2
5 6 3 4
9
3 2 9
Hard #8
2 8
5 7 8 9
8 4 9 5 1
1 6 5
7 2 6 3
3 6 5
6 2
4 6
2 9 1 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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