Printable Hard Sudoku

Set 1m6qln6. 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
7 5 8
9 7 6 8
2 8 1 6 4
6 5 2
4 9 3
8 4
7 6
3 8 9
4 1 7 5
Hard #2
2 9
6 3 9
1 6
7 3 8 1
5 3 7 9
6 7 4
5 2 6 7
4 8 6
4 9 3 2
Hard #3
6 3 8 7
9 8 3
3 1
8 2 5 6
3 2
4 2 1 9 3
1 4
7 6 5
7 1 5 3
Hard #4
5 8
2 6 9 1
6 5 3
2 9 1 8
8 3 4
3 9
7 1 4
6 8 5 9
4 5 1 2
Hard #5
9 2 1
6 9 3 5
4 8 7
7 2
8 3 1
4 8 3
3 4 1 5
4 9 8
1 7 4 6
Hard #6
1 3 8
7 2 1
8 9 4
5
6 7 4 9 5
3 9 4 7 6
5
9 6 5 1
5 8 3 9
Hard #7
1 4
4 8 7 9
6 8 7 3
5 8 6
3 2 9 7 4 8 1
3 9 7
9
2 7 4
1 3
Hard #8
3 5 7 9
9 3
8 1 6
4 3 6 2 8
6 2 8 1 5 3 4 7
1
4 1 2
3
6 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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