Printable Hard Sudoku

Set 4ppea9. 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
6 8
5 9 3
7 1
9 3 6 7 1
9 5
7 5 4 1 3
6 9 5 4
4 6 9
1 2 8
Hard #2
2 1 9 4
5 7 6
8 5 1
4 8
5 9
7 8 6 2 1 5
9 2
4 8 5
3 2 5 6
Hard #3
8 4
9 5 6 2
4 3 7 8
4 2 8 1 5
9 6 4
1
2 6 1
4 7 3
5 1 3 8
Hard #4
6 2 4 9
8 7 5
3 2 4
9 5 7 6
5 2 1
4 9 7 8
7 2 4
5 9 4 2 3
Hard #5
1 5 4
3 1 2 6
9
4 3 7 9
9 7 6
6 9 1 2
4 6 2
9 7 8 3
2 4 5
Hard #6
3 2 7 5 8
4 6
8 3
2 6 5 3
6 8 1
5 8 2
7 1 5 9 6
6 9 8 2
1
Hard #7
1 3 4 6 2
4 9 5 8 1
3 2 9 5
5 3 1
8
4 5 2 6
6 7 3
7 6 4 3
Hard #8
9 5 2 7
2 1 9 8
8 5 7 6
5 9 4
8 6
3 6 9
3 5 8
6 7 3
8 1 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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