Printable Hard Sudoku

Set jp1bji. 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
3 1 5 9 4
6 7
6 9 2 7 4 3
5 1 2
6 8 4
7 5
1
6 8
8 4 3 1 5
Hard #2
3 4 7 6 9
1
8 1
9 5
7 8 5 4
9 5 4 1 3
2 7 5
4 5 6 8
3 9 2
Hard #3
1 8 7
8 3 5 9
2
8 9 5
6 8 2
1 7 4
4 2 7 1
2 1 7 5
7 3 8 6
Hard #4
1 5 6 2
2 6 9 5 8 4
9
8 9 7 3
7 4 2 9 8
7 3
5 9 1 7 6
2 1
Hard #5
2 8 9 5
5 9 8 4
7 3 5 2 8
8 5 6 7
8 1
3 9
9 4 7
7 2 4
4 1
Hard #6
1 8 3 6
2 9
4 7 6 2
7 2 5
3
1 5 6 8
7 9 3 2
5 3 8 7
2 9 5
Hard #7
3 4
3 1 9
4 9 6 2
4 7 2
6 1 7 5
5 8 1 7
7 6 8
9
1 6 7 3 2
Hard #8
7 4
6 2 9
5 7 9 2
1 8 3
8 5 2
3 7 2 4
2 6 3
9
9 4 1 3 7 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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