Printable Hard Sudoku

Set 1qdnkc9. 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 8 3 4
7 6 9
2 6 9
9 2
3
1 6 9 7 3
5 4 6 7 1
6 4
5 1 8 9
Hard #2
3 1 9 6
8 2 6 7 5
9 7 1
4 9 8 6
1 5 2 4
9 6 4 1
2 5 8
5
7
Hard #3
4 9 5 2
3 8 1 4
3 6
3 7 6 4
8 2
5 8 4 7 1
5 1 9
6 5
5 3 7
Hard #4
4 5 6
6 8 2 4
5 7 1
1 4 2
2 3 6 5 8
4 9 3
4 3
8 6 5 2
7 4
Hard #5
2 1 8
9 6 5 2
1 8 4 9
5 2 3
4 7 2 6
9 8
2
3 4 1 9
5 6 3 4
Hard #6
1 5 9 2 8
1 9
2 6 3
6
5 6 8
8 1 7
1 8 2 9 3 7
6 1
3 9 7 8
Hard #7
7 1
5 1 4 3
3 9 6
4 7
9 4 8
2 5 6 9 1 3
6 3 5
1
3 4 8 2 7
Hard #8
5 2 6
1 3 2
4 1 9 3
6 7
8 9 1 7
7 9
9 7 8 6 4
3 1 9
2 5 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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