Printable Hard Sudoku

Set qqvx15. 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 7 9 5
9 6 1
5 3 6 9 4 7
5 3 7 6
9
7 6 1
5 3 4 7
3 1 6 8
Hard #2
7 5 1 4
1 9 7
9 4 2 6
7 8 5
4 2 6 9
6 9 3
9 1 6 4
2 3 8
3
Hard #3
7 4 1 5
9 5 1
2 1 3 9
9 2 4
4 9 3 2
1 7 3
5 6 7
1 6
8 1 3
Hard #4
7 9 6 2
1 7
8 3 5
6 4 8
8 2 4 1 7
4 3 2
4 5 9
2
5 2 4 3 9
Hard #5
8 1 6
2 9
8 6 2
2 8 3 4 9
4 1 7
7 9 5 8
9 7 2 3
2 1 5
6 1
Hard #6
3 2 9 8 5
5 7 4
7 8 3 6
1 2 3
6 9 7 2
4
2 5 4 6
3 4
6 5 9
Hard #7
9 8
1 5 9 2
2 6 7 4 9
8 5
1 9
6 3 2 7
3 7 2 1
9 1 5 3
8 7
Hard #8
3 1
4 8 6
3 1 6 4 7
2 6
6 2 9 7 1
7 1 9
1
8 9 4
9 2 6 8 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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