Printable Hard Sudoku

Set 1e6q99h. 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 8 9 6
1 3
2 8
3 4 5
6 1 4 9
9 4
5 7 4 6
6 1 7 5
1 7 6
Hard #2
7 5 3 1
5 3
6 9
3 2 6 9
7 1
6 5 1
4 9 8
6 2 1 8 9 5
8 5 2
Hard #3
8 2 5 1
4 9 2
1 9 8 6
4 1 7
5 9
6 3
3 1 7 6
5 6 4 3
2 3 8
Hard #4
4 2 6
4 7 9
6 4 7
8 3 1 4
8 9 5
3 2 1 8
6 3 1
8 1 6 3 2
2
Hard #5
7 1 2
5
4 8 5 9 1
7 8 5 3
3 9 7
1 6 2
8 3 5 9
9 6
3 5 7 6
Hard #6
3 1 9 2 5
8 2 3 9
1 7
3 7 4
9
7 5 8 4
5 9 1 7
9 6 4
3 7 8
Hard #7
3 2 8 6 5
7 4 3
1 9 4
4 9 5 6 3 8
8 9 4
6
1 2
7 2 3 8
8 7
Hard #8
5 9 3 4
8 1 5
8 4 7
5 9 4
8 7 6
2 9 1
5 3 2 6 1
8 6 4
2 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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