Printable Hard Sudoku

Set 14a9qk4. 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
2 6 9
4 1
1 8
6 4 3 7
3 7 2 9
9 1 6
9 4 3 8
7 3 4
4 2 3 6
Hard #2
8 3 6
6 3 9
6
2 7 8 9
8
7 4 8 1
7 9 4 5 2 3
8 1 4 7
5 2 9
Hard #3
2 5 6
8 5
9 1 7 3
3 5 9 4
8 4 7
7 2 1
5 2 6 8
6 8 3
4 5 9
Hard #4
9 1 7 2 4
2 3
4 5 2 9
3 7 1
8 4 6 5
2 5 9
4 8 5
1 6
9 3 6
Hard #5
8 7 6 3
2 4 7
5 4
6 5 2 8
3 6 9
1 8 3
7 1 6 9
9 2 1
2 9 7
Hard #6
1 6 9 4
2
4 5 3 8
1
3 9 8 2
8 1 6
7 8 1 2 4
9 3
8 6 4 5 9
Hard #7
2 7 3
4 5 1
7 4 8
6 8
7 8 4 5
9 1
4 3 9 5
8 1 2 4 5
7 5 6
Hard #8
2 3 1 8
3 9 5 1 6
1 6
9 4
5 8 7
2 6 4
3 5 4 9 1
6 1 2 4
8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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