Printable Hard Sudoku

Set 10shq4t. 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 2 4 1 9
8 5
2 1 8
8 2 7 1
1 2
4 7 5 2
7 1
1 6 4
8 9 3 6
Hard #2
9 7 3
4 2 9 5
5 2 1 6
9 2 1 5
4 6 7 8
8 3 2
6 9 7
4
5 1 3
Hard #3
5 3 2 7
7 2 8
4
1 9 3 4
7 6 8 1
6 2 7 3
2 5 9
6 8 2
2 8 6
Hard #4
9 4 8 6
8 7
7 5 9 4 1
5
3 4 1 2 6 5
5 2 8 3
1 6
9 7 2 5
8
Hard #5
4
1 3
8 5 6 9
5 6 1
9
1 3 4 7 5 2
5 4 7 3 9
2 6
6 8 1 3 5
Hard #6
7 4
2 9 8
3 6 8 2 1
6 8 5
5 2 9 6
9 3 1 4
1 2 9
8 3
4 6 3
Hard #7
8
6 9 8 2
3 7 5 4 6
9 5
6 3 2
7 9 1
1 5 2 6
1 8 3
3 9 8 7
Hard #8
9 2 5
8 4 1
5 9
5 6 3
1 5 7 4
8 9 7
9 8 1 3 5
5 7
3 9 8 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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