Printable Hard Sudoku

Set k15v0r. 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
1 4 9 7
2 3 1
8 9 7 4 2
6 9
8 7 5 3
2 7
7 8
1 9 2
9 4 2 6
Hard #2
2 3 8
5 9 3
8 4 6 7
7 9 5
6 7 5 2 9
6 2 7
3 6
6 4 9
7 4 1
Hard #3
9 4 3
2 6 1
5 9 2 7
5 9 4 7
9 3 5 2
8 3 6 7
2
5 7 1
8 4 2
Hard #4
1 8 9 7
6 3
4 3 7 6 2 8
1 3 5
9 2 1 6
4 8
4 5 1
5 2
4 7 6
Hard #5
8 4
3
9 7 6 2 8
8 2 3
1 7 8
3 6 7 9
7 1 5 9
4 9 6
5 1 3 8
Hard #6
9 3 4 6 2
5
1 9 7
9 2
8 1 5 6
6 4
7 8 9 2 6
9 1 7 8
3 6 2
Hard #7
4 5 8 1
9 3 2
8
8 5 7 6
6 2 8 3
4 9 3 6
9 8 6
5 2 4
8 3 9
Hard #8
8 6
6 4 1 3
5 4
8 9 1 6 5
1 3 7 9
2 7
6 9 1 4
4 2
3 1 9 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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