Printable Hard Sudoku

Set 9ie6ny. 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
1 8 7 6 3
8 9
5 6 2 4 1 9 3
4 5 3 7
2 6
6 9 2
5 7 4
5 1
Hard #2
3 9
1 8 6 5
4 3 9 6
5 7 6 8
2 5 4
8 3 4
1 4 8 5 7
6 1 2
5
Hard #3
9 5
3 5 4 8
4 8 9
2
2 4 1 9 7
6 8
1 3 8 2 4
8 4 1 6
5 9 8
Hard #4
2 7 5
1 6 7
4 5 1
3 2 8
7 6 4 3
5 4 2
4 2 1 9 8
9 7
3 8 2
Hard #5
5 2 8
8 9 4
1 7 3
2 6 9 7 3
7 8 5 4 6
9 5
6 2
5 4
3 1 5 9
Hard #6
8 6 9 3
1
1 3 2 6 4
6 8 7 9
7 1 4 6 5
3 9 6
1 8 3 7
2
6 8
Hard #7
8 5 3 4
7 2 4
8
4
3 6 4 9
9 7 1 5
9 1 2 8
3 8 2 7
7 6 5 1
Hard #8
3 6 4
7 1 9
9 3 1 2
1 5 9 2 7 6
9 7 3
8 4
2 1
6 3 5
7 5 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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